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Publication numberUS3831552 A
Publication typeGrant
Publication dateAug 27, 1974
Filing dateFeb 7, 1972
Priority dateFeb 7, 1972
Also published asCA973358A, CA973358A1, DE2305395A1
Publication numberUS 3831552 A, US 3831552A, US-A-3831552, US3831552 A, US3831552A
InventorsConroy R, Jones L, Schmidt G, Smith J
Original AssigneeIdenticator Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Fingerprinting apparatus
US 3831552 A
Abstract
A fingerprinting apparatus is disclosed for developing latent fingerprints impressed on the surface of a medium, such as a check. The apparatus comprises a casing having an enclosed cavity formed therein for containing a supply of magnetizable powder. A slot is formed in the upper portion of the casing defining an opening over the cavity. A spring biased cover is mounted over the opening to enclose the cavity and prevent the powder from spilling out during non-use. A folded holder is adapted to receive the medium within the fold. The bottom fold of the holder has an open window formed thereon for displaying the latent fingerprint on the medium. The holder is adapted to be inserted within the slot and under the cover, and is positioned to expose the window directly over the opening of the cavity. A magnet is rotatably mounted within the cavity and includes at least one pole which is adapted to physically contact the powder for attracting a quantity of powder thereon. The pole of the magnet is then rotated upwardly to pass over the opening of the cavity to brush a portion of the powder onto the surface of the medium. A portion of the powder deposited on the magnet adheres to the oils defining the latent fingerprint, but not to portions of the surface devoid of such oils, to produce a visible image of the fingerprint. The magnet is rotated by a gear and arcuate rack drive combination. The arcuate rack is formed on a lever which is pivotally mounted on the sidewall of the casing. A hammer is also pivotally mounted on the sidewall of the casing and is adapted to be cocked and triggered by the lever to strike the holder to shake loose any excess powder deposited on the impressed fingerprint.
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United States Patent 1191 Schmidt et al.

' FINGERPRINTING APPARATUS [75] Inventors: Gerald W. Schmidt, Woodland Hills; Jay Smith, III; Lawrence T.

Jones, both of Pacific Palisades; Richard F. M. Conroy, Woodland Hills, all of Calif.

[73] Assignee: Identicator Corporation, San

Francisco, Calif.

[22] Filed: Feb. 7, 1972 [21] Appl. No.: 224,025

[52] US. Cl l18/3l.5, 118/57, 118/637 [51] Int. Cl B05b 17/00 [58] Field of Search ll8/3l.5, 57, 637, 308, l18/D1G. 24; 1l7/l7.5, .5, l, 1.5; 134/143 [56] References Cited UNITED STATES PATENTS 924,934 6/1909 Reverdys 134/143 1,676,020 7/1928 Glass et al. 1l8/31.5 1,883,535 10/1932 Burnett 118/57 X 2,600,580 6/1952 Sabel et al. 118/637 X 2,791,949 5/1957 Simmons et al. 118/637 X 2,874,063 2/1959 Greig 118/637 X 2,952,241 9/1960 Clark et a1. 118/637 3,202,092 8/1965 Childress 118/637 X 3,207,129 9/1965 Limberger.... 118/637 3,316,875 5/1967 Murray et al. 1l8/D1G. 24 3,316,878 5/1967 Ferrari et a1 118/637 3,318,284 5/1967 Hojo et al. 118/637 3,502,052 3/1970 Walsh 118/57 3,549,397 12/1970 McDonald et al. ll8/3l.5 X 3,584,958 6/1971 Miller et a1. ll8/31.5 UX 3,592,675 7/1971 Cheng 118/637 UX Primary Examiner-Morris Kaplan Attorney, Agent, or Firm-Jackson & Jones [111 3,831,552 [451 Aug. 27, 1974 [57] ABSTRACT A fingerprinting apparatus is disclosed for developing latent fingerprints impressed on the surface of a medium, such as a check. The apparatus comprises a casing having an enclosed cavity formed therein for containing a supply of magnetizable powder. A slot is formed in the upper portion of the casing defining an opening over the cavity. A spring biased cover is mounted over the opening to enclose the cavity and prevent the powder from spilling out during non-use. A folded holder is adapted to receive the medium within the fold. The bottom fold of the holder has an open window formed thereon for displaying the latent fingerprint on the medium. The holder is adapted to be inserted within the slot and under the cover, and is positioned to expose the window directly over the opening of the cavity. A magnet is rotatably mounted within the cavity and includes at least one pole which is adapted to physically contact the powder for attracting a quantity of powder thereon. The pole of the magnet is then rotated upwardly to pass over the opening of the cavity to brush a portion of the powder onto the surface of the medium. A portion of the powder deposited on the magnet adheres to the oils defining the latent fingerprint, but not to portions of the surface devoid of such oils, to produce a visible image of the fingerprint. The magnet is rotated by a gear and arcuate rack drive combination. The arcuate rack is formed on a lever which is pivotally mounted on the sidewall of the casing. A hammer is also pivotally mounted on the sidewall of the casing and is adapted to be cocked and triggered by the lever to strike the holder to shake loose any excess powder deposited on the impressed fingerprint.

26 Claims, 9 Drawing Figures PATENTEDAUEZHSM SEETZIQ I BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates generally to fingerprinting systems and more particularly to fingerprinting systems utilizing magnetizable powder as the developer.

2. Description of the Prior Art Because of the many annoyances and inconveniences concomitant with taking fingerprints with ink, various systems have been patented and/or developed which utilize magnetizable powder as the developer.

One of the earliest systems utilizing magnetizable powder is described in US. Pat. No. 3,132,036. In such a system, a latent fingerprint is developed by brushing the same with the magnetizable powder material. The brushing procedure is accomplished by utilizing a magnet having a cluster of magnetizable powder surrounding one pole of the magnet. Upon brushing the powder onto the surface'of the medium, the powder adheres to the oil defining the fingerprint, but not to the portions of the medium devoid of such oils, to produce a visible image of the fingerprint.

Although this method is being used extensively to find and develop latent fingerprints, especially by law enforcement agencies, certain problems are encountered when such a system is utilized for other uses such as a means of identification on checks, passports, and similar commercial papers. The main problem encountered lies in the brushing of the powder mixture to develop the print. In loose form, the developing powder is very messy to handle and great care must be taken to avoid soiling other portions of the medium or other objects in the immediate area. As a result, such a system cannot be utilized in department stores, grocery markets, etc.

This problem has been somewhat alleviated in an apparatus described in US. Pat. No. 3,549,397. In that patented disclosure, the magnetizable powder is contained in a cavity formed in a casing. Themedium with the latent fingerprint impressed on it is positioned over the cavity with the fingerprint facing the quantity of powder. A cover having a movable magnet mounted thereon is placed over the medium on the side opposite the side of the medium having the fingerprint impressed thereon. In operation, after the medium is placed over the cavity and the top cover is positioned over the medium, the magnet is lowered to a position adjacent the top side of the medium. This proximity of I the magnet causes the powder to be attracted against the bottom surface of the medium and adhere to the fingerprint impression. After which, the magnet and the cover are moved away from the medium and the medium is withdrawn from the-apparatus with the visible image of the fingerprint illustrated thereon.

Although such an apparatus is an improvement over prior systems, several shortcomings are still present which have prevented its commercial utilization.

The main shortcoming of the apparatus is that the disposition of the medium between the magnet and the powder reduces the attraction force of the magnet. Consequently, the magnet cannot attract a sufficient amount of powder to the medium to produce a clear and distinguishable print.

Another shortcoming of the apparatus is that when the cover is removed, the powder can still spill out of the cavity to soil the paper or anything else it contacts. This, of course, is unacceptable for commercial uses in department stores, grocery markets, etc.

What is required by such users is that the apparatus must produce high quality prints automatically, conveniently and cleanly.

SUMMARY OF THE INVENTION formed therein for containing a supply of magnetizable powder. A magnet is rotatively mounted within the cavity and is adapted to attract and transport a quantity of I the powder for brushing the powderattracted thereto onto the surface of the medium having the latent fingerprint impressed thereon. A portion of the powder adheres to the oils of the latent fingerprint to produce a visible image of the print.

A primary advantage of the present invention is that the entire operation is accomplished automatically and cleanly with a minimum of steps. This convenience factor makes the apparatus highly attractive for commercial use.

Another important advantage of the present invention is that even though the developing operation is fully automatic, the developed fingerprints are still of a very high quality.

The features of the present invention which are believed to be novel are set forth with particularity in the appended claims. The present invention, both as to its organization and manner of operation, together with further objects and advantages thereof, may best be understood by reference to the following description, taken in connection with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a fingerprinting apparatus of the present invention;

FIG. 2 is a sectional view of the fingerprinting apparatus taken along lines 22 of FIG. 1 showing a compartment containing magnetic powder having a magnet rotatively mounted therein;

FIG. 3 is a sectional view of the apparatus taken along lines 3-3 of FIG. 2;

FIG. 4 is a sectional view of the apparatus taken along lines 4-4 of FIG. l'showing the lever construction;

FIG. 5 is a sectional view of the apparatus taken along lines 55 of FIG. 4;

FIG. 6 is a perspective view of one of the levers;

FIG. 7 is a sectional view of the apparatus similar to FIG. 4, except that the lever is in a depressed position;

FIG. 8 is a perspective view of a folded holder; and

FIG. 9 is an enlarged fragmentary view of the cover assembly with the folder inserted in the apparatus.

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now to the drawings, FIG. 1 shows a fingerprinting apparatus generally indicated by arrow 10,

comprising a casing 11 mounted on a base 13 with the casing 11 having a pair of vertical slots 15 formed on the forward end wall 16. A cover plate 17 is mounted over the outer casing 11 and is supported on two sides and bonded to an L-shaped member 18 integrally formed on the top of the forward end wall 16 and a side wall 19. The other two peripheral sides of the cover plate 17 are unsupported and cooperate with the upper edges of the side wall 20 and rear end wall 21 to form a slot 22 for receiving a folded holder 23. A handle 25 is located at the forward end of the casing and is mounted at both ends onto a pair of levers 27 and 28 respectively.

As shown in FIG. 2, the casing 11 is secured to the base by a pair of threaded bolts 29. The forward half of the base includes a bowl-like structure 31 having a cavity 33 formed therein. The cavity 33 is also formed at its upper half by an opening 35 formed in the casing 11. The cavity 33 is adapted to contain a supply of magnetiizable powder 37. The powder 37 may be of any conventional magnetizable material such as iron, nickel, or the like.

The top of the opening 35 and support member 36 is enclosed by a cover 39 which is biased by a spring 41 to keep the cavity 33 enclosed during non-use.

An arm 43 is rotatably mounted within the cavity 33 with the outer extremity of the arm supporting a pair of magnets 45. As shown in FIG. 3, the magnet arm 43 is mounted on a shaft 47 which is journaled within a pair of bearings 49. The bearings are mounted within a pair of bores formed by the mating inner walls of the casing 11 and base 13. A pair of pinion gears 53 is integrally mounted on the extremity of the shaft 47 which extends through the inner walls into a pair of lever chambers 55. The lever construction is not shown in FIG. 3 for the sake of clarity.

Referring now to FIGS. 4 8, the levers 27 and 28 are pivotally mounted at the rearward end of the chambers 55 to a pair ofjournal bearings 57 formed on the base 13 by means of a shaft 59. As stated previously, the forward extremity of the levers 27 and 28 extend through a pair of vertical slots 15 for supporting the handle 25. Each of the levers 27 and 28 are biasly supported by a coil spring 60 in the upward direction. Each of the levers 27 and 28 further includes an arcuate gear section 61 which is adapted to engage a corresponding pinion gear 53. It is the arcuate movement of the levers 27 and 28 and their gear sectors 61 that rotatingly drives the pinion gear 53.

As more clearly shown in FIG. 6, the lever 27 also includes an inwardly extending lug 63 and a trigger 65. The lever 27 also includes a cut out portion 67. The lug 63 is adapted to engage the arm portion 69 of a hammer 71 during downward movement of the lever 27. (See FIG. 7). The arm portion 69 of the hammer 71 is also pivotally supported on the shaft 59. A coil spring 73 is mounted on the base 13 and is adapted to biasingly engage the bottom of the arm portion 69 for biasing the arm portion of the arm upwardly. The upper extremity of the hammer 71 is adapted to extend through an aperture 75 formed in the upper wall or support member 36 of the casing 11. The lower extremity of the hammer also includes a projection 77 which is adapted to engage a shoulder 79 ofa sear 81. The sear 81 is pivotally mounted on an inner wall and includes an arcuate sector 83 and a leg section 85. The leg section 85 includes the shoulder 79 while the arcuate section is adapted to be engaged by the trigger 65.

FIGS. 1 and 8 show the holder 23 which is preferably made of a folded sheet of plastic with the lower fold having a window 87 formed therein. The holder 23 is adapted to receive and support any medium such as a check in which a latent fingerprint is impressed thereon. A portion of the medium having the fingerprint is adapted to be exposed through the window. The top side of the folder 87 also includes an indented area 89, the function of which will be described hereinafter.

OPERATION A typical example of the utilization of the fingerprinting apparatus 10 is its use by vendors such as department stores, grocery stores, liquor stores, etc. which would utilize fingerprints as a positive means of identification for check cashing purposes. For example, when cashing a check, after the drawer endorses the check, the salesman would take the check and position it into the holder 23, preferably with the back side of the check facing the window 87. After which, the drawer would impress his fingerprint on the portion of the check exposed through the window 87.

The holder is then taken and inserted within the slot 22 formed in the apparatus until the forward end contacts the corner formed by the L-shaped member 18. During this movement, the holder 23 contacts the beveled rim 90 of the cover 39 to lift it upwardly to enable the holder 23 to pass therethrough. As more clearly shown in FIG. 9, the holder 23 is positioned such that the indented area 89 fits snugly in an annular portion 91 formed in the cover 39. In this position, the window 87 of the holder 23 which is located on the lower side thereof is mounted directly over the opening 35 of the cavity 33.

After the holder is fully inserted within the slot 21, the handle 25 is then depressed to move the levers 27 and 28 downwardly against the forces of springs 60. This downward movement of the levers 27 and 28 causes their arcuate sectors 61 to rotate the pinion gears 53 in the clockwise direction as shown in FIG. 4. This gear movement is transmitted to the magnet arm 43 to cause the arm to move in the same clockwise direction as shown in FIG. 2. As the magnet arm 43 rotates, the extremity thereof containing the magnet 45 passes over the quantity of magnetic powder 37 to attract a portion of the powder 37 to the magnets 45. During further downward travel of the levers 27 and 28, the magnets 45 are further moved to pass across the opening 35 of the cavity 33 to brush the cluster of powder 37 against the surface of the check. During such contact, a portion of the powder adheres to the oil defining the latent fingerprint. but not to portions of the check surface devoid of such oils. After which, the levers 27 and 28 are then released and permitted to be biased to their upward position by the coil springs 60. The upward movement of the levers 27 and 28 causes the magnet arm 43 to rotate in a counterclockwise direction to again pass over the opening 35 of the cavity 33 to enable the magnet 45 to attract the excess quantity of powder 37. The magnet arm 43 then continues to rotate in a counterclockwise direction to the position shown in solid lines in FIG. 2.

The movement of the lever arm 27 also controls the operation of the hammer 71 to further ensure against any excess powder deposits on the fingerprint. As stated above, the downward movement of the lever 27 causes the lug 63 to force the hammer arm 69 downw'ardly until the projection 77 engages the shoulder 79 of the sear 81. (See FIG. 7). The sear 81 is caused to fall into that engaging position because of the eccentrically mounted weight formed by the arcuate section 83 thereon. This portion of the sear 81 keeps the hammer 71 in a cocked position until the lever 27 is again permitted to be raised. The upward movement of the lever 27 enables the lug 63 to move away from the hammer arm 69 a sufficient distance so as not to impede its striking movement. During the upward movement of the lever 27, the trigger 65 contacts the arcuate sector 63 of the sear 81 to move the sear 81 in a counterclockwise direction as shown in FIG. 4. This rotational movement causes the shoulder 79 to move away from the projection 77 of the hammer 71 to unlock or release the hammer 71. The released hammer 71 is then forced upwardly by the coil spring 73 in a rapid manner to enable the hammer to extend through the aperture 75 to strike the holder 25. This causes any excess powder remaining on the fingerprint to be jarred loose to fall back into the cavity 33. After this action is completed, the holder 23 is removed from the apparatus 10 and the check is removed from the holder with the visible fingerprint clearly formed thereon.

As can be seen, the entire developing operation of the apparatus 10 is done automatically without the operator touching the magnets or the magnetic powder. All that is required is placing the medium in the holder, inserting the holder within the apparatus, depressing the levers and releasing. The holder is then taken out of the slot and the medium is taken out of the holder with a clear and permanent fingerprint formed thereon. Moreover, the quality of the fingerprint is very high. Another advantage of the apparatus is after the card holder 23 is removed from the slot 21, the cover 39 is biased downwardly onto the opening 35 to enclose the cavity 33 to prevent any powder 37 from spilling.

It should be noted that various modifications can be made to the apparatus while still remaining within the purview of the following claims. Various modifications can also be made in the method of takingprints on the medium. For example, after the medium is endorsed, it could first be positioned within the card holder 23, and then the finger imprint would be made on the portion of the medium being exposed through the window 87.

What, is claimed is: l. A fingerprinting apparatus for developing a fingerprint impressed on the surface of a medium comprising:

a casing having an enclosed cavity formed therein for containing a supply of magnetizable powder, said casing having a slot formed therein defining an opening over said cavity, said slot adapted to receive the medium with the fingerprinted surface facing the opening of said cavity;

a magnet movably mounted within said cavity to extend into the portion of the cavity containing the powder and to attract and carry a cluster of powder across the opening of the cavity to enable the powder to contact and adhere to the fingerprint impressed on the medium;

jogger means disposed within the casing for. removing excess powder from the medium before the medium is entirely removed from said casing whereby distortion of the fingerprint is prevented; and

means on a forward stroke, actuating said magnet for the powder carrying operation and, on a return stroke, actuating said jogger means.

2. The invention of claim 1 wherein said magnet is rotatably mounted within said cavity.

3. The invention of claim 2 wherein said apparatus further comprises means for enclosing the portion of said cavity containing the magnetizable powder during non-use.

4. The invention of claim 3 wherein said enclosing means comprises a spring biased cover mounted over the opening, said cover being movable to permit the medium to slide under the cover to extend over the opening.

5. A fingerprinting apparatus for developing a fingerprint impressed on the surface of a medium comprising:

a casing having a cavity thereon adapted to contain a supply of magnetizable powder;

a container in said cavity adapted to hold said supply of magnetizable powder; means for receiving and supporting said medium adjacent said container including an aperture communicating with said container and a slot formed in said casing adapted to receive said medium;

means for enclosing said aperture to maintain said magnetizable powder in said container during nonuse including a resiliently biased cover mounted over the aperture in said means for receiving and supporting, said cover extending into said slot;

said medium comprising means for forcing said resilient cover away from said aperture, whereby in response to said medium passing under the resiliently biased cover, said cover is moved away from said aperture to a position operatively retaining said medium over said aperture; and

a magnet movably mounted within said casing, said magnet adapted to attract and brush a quantity of magnetizable powder onto the surface of said medium having the fingerprint impressed thereon.

6. The invention of claim 5 wherein said means for receiving and supporting the medium comprises means for supporting the medium in a horizontal plane.

7. The invention of claim 5 further including means on the housing for removing any excess magnetizable powder from the medium.

8. A fingerprinting apparatus for developing a fingerprint impressed on the surface of a medium comprising:

a casing having a cavity therein adapted to contain a supply of magnetizable powder;

container in said cavity adapted to hold said supply of magnetizable powder;

means for receiving and supporting said medium adjacent said container including an aperture communicating with said container;

a magnet movably mounted within said container, said magnet adapted to attract and brush a quantity of magnetizable powder onto the surface of said medium having the fingerprint impressed thereon;

means for moving said magnet including a shaft, at least one lever and a gear on said shaft wherein the shaft is mounted in said container and said lever is capable of moving said shaft through engagement with said gear;

means for removing excess powder from said medium including a resiliently biased hammer mounted in said casing; and

means on said lever for cocking said hammer into an operative position as said lever is moving said magnet to brush said magnetizable powder onto the surface of said medium.

9. The invention of claim 8 wherein said lever comprises means for triggering said hammer as said lever is returning to its initial position.

10. The invention of claim 9 wherein said cocking means comprises a lug mounted on said lever for contacting said hammer to move it against the bias of the spring, and a sear, pivotally mounted on said casing side wall, comprising a shoulder for engaging a projection formed on said hammer.

Ill. The invention of claim 10 wherein said triggering means comprises a second lug formed on said lever for contacting and pivoting said sear out of engagement with the projection formed on said hammer.

112. A fingerprinting apparatus for developing the imprint of a fingerprint that is impressed on a surface of a medium such as a check by a person. the medium capable of retaining the oils of the persons fingerprint comprising:

a housing;

a container mounted in the housing and adapted to hold a supply of magnetizable powder;

a holder adapted to receive the medium. the holder having an opening to expose the fingerprinted surface of the medium;

a support member adapted to supportingly receive the holder and medium therewith and having an aperture communicating with the container whereby at least a portion of the medium with the fingerprinted surface facing the aperture can be operatively exposed to the magnetizable powder in the container;

a magnet rotatably mounted within the container to operatively contact the magnetizable powder and carry at least a portion of the powder across the ap erture in the support member to enable the aperture in the support member to enable the magnetizable powder to contact and adhere to the fingerprint impressed on the medium;

means for rotatably moving the magnet in the container;

a cover member connected to the housing and adapted to extend over the support member; and sealing means on the cover member for sealing said aperture and movable in response to entry of said holder and medium therewith whereby to press said holder and medium into a stationary sealing contact with the support member about the aperture whereby the magnetizable powder will only contact the fingerprinted surface of the medium exposed through the aperture and the surplus magnetizable powder will remain in the container.

13. The invention of claim 12 further including means on the housing for removing any excess magnetizable powder from the medium.

M. The invention of claim 12 wherein the sealing means on the cover member includes a resilient member that is biased to close the aperture and retain the magnetizable powder when no medium is inserted under the cover member.

115. A fingerprinting apparatus for developing the imprint of a fingerprint that is impressed on a surface of a medium such as a check by a person, the medium capable of retaining the oils of the persons fingerprint comprising:

a housing;

a container member mounted in the housing and adapted to hold a supply of magnetizable powder;

a support member adapted to supportingly receive the medium and having an aperture communicating the medium with the fingerprinted surface facing the aperture can be operatively exposed to the magnetizable powder in the container;

a magnet movably mounted within the container to operatively contact the magnetizable powder and carry at least a portion of the powder across the aperture in the support member to enable the powder to contact and adhere to the fingerprint impressed on the medium;

means for moving the magnet;

a cover member connected to the housing adapted to extend over the support member and form therewith a slot for receiving the medium;

resilient means on the cover member for sealingly pressing the perimeter of the aperture to close the aperture directly when there is no medium present and to press the medium into a stationary sealing contact with the support member when there is a medium operatively positioned over the aperture whereby the magnetizable powder will only contact the fingerprinted surface of the medium exposed through the aperture and the surplus magnetizable powder will remain in the container; and

means on the housing for removing any excess magnetizable powder from the medium.

16. The invention of claim 15 wherein the means for moving the magnet further rotates the magnet twice across the aperture, once in one direction and then a second time in the other direction.

17. The invention of claim 15 wherein the resilient means substantially extends only over that portion of the support member with the aperture.

18. The invention of claim 15 wherein the cover member is fixedly mounted across the support member to form a slot for the medium.

19. The invention of claim 15 wherein said means on the housing for removing any excess powder includes a spring biased hammer pivotally mounted in the housmg.

20. The invention of claim 19 further including means for cocking the hammer as the magnet is rotated to brush powder onto the surface of the medium.

211. The invention of claim 15 wherein said magnet is rotatively mounted within the container.

22. The invention of claim 18 wherein said slot is horizontal.

23. The invention of claim 15 wherein said resilient means comprises a spring biased cover mounted over the aperture.

24. A fingerprinting apparatus for developing a fin- 5 gerprint on the surface of a medium comprising:

a casing having an enclosed cavity formed therein for containing a supply of magnetizable powder and providing an opening over said cavity;

a magnet movably mounted within said cavity to extend into the portion of the cavity containing the powder and to attract and carry a cluster of powder across the opening of the cavity;

a casing cover plate portion positioned above the cavity opening and spaced therefrom;

a cover located between the cavity and the casing cover plate and normally biased for closing the opening in the cavity in the absence of a medium;

biasing means extending between the casing cover plate and the cover to effect said bias and yieldable in response to a said medium passing under the cover for sealingly forcing a non-charged said medium carrying oil of a fingerprint to be developed into a fixed position over the opening in said cavity after said medium is in place over said cavity;

means operable when said biasing means has sealingly positioned said medium over said cavity for moving said magnet to carry a cluster of powder into contact with the fingerprint oil on said medium; and

means for removing excess powder from said medium.

25. The invention of claim 24 wherein the biasing means includes at least one spring.

26. A fingerprinting apparatus for developing the imprint of a fingerprint that is impressed on a surface of a medium such as a check by a person, the medium capable of retaining the oils of the persons fingerprint comprising:

a housing;

a container mounted in the housing and adapted to hold a supply of magnetizable powder;

a support member adapted to supportingly receive the medium and having an aperture communicating with the container whereby at least a portion of the medium with the fingerprinted surface facing the aperture can be operatively exposed to the magnetizable powder in the container;

a magnet rotatably mounted within the container to operatively contact the magnetizable powder and carry at least a portion of the powder across the aperture in the support member to enable the magnetizable powder to contact and adhere to the fingerprint impressed on the medium;

means for rotatably moving the magnet in the container;

a cover member connected to the housing and adapted to extend over the support member;

sealing means on the cover member for pressing the medium into a stationary sealing contact with the support member about the aperture whereby the magnetizable powder will only contact the fingerprinted surface of the medium exposed through the aperture and the surplus magnetizable powder will remain in the container, and

a holder adapted to receive the medium, the holder having an opening to expose the fingerprinted surface of the medium, the holder capable of moving the sealing means to permit access to the aperture.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent 3.831.552 Dated August 27, 1 974 lnventofls) Gerald W. Schmidt et al It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Column 8, line 14, after "ing", insert "with the container whereby at least a portion of".

Signed 'and sealed this 3rd day of December 1974.

(SEAL) Attest:

McCOY M. GIBSON JR. c. MARSHALL DANN Attesting Officer I v Commissioner.- of Patents FORM PO-1050 (10-69) USCOMM'DC 60876-P69 v.5. GOVERNMENT PRINTING ornc: I!" o-aic-su,

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent I 3.831.552 Dated Auqust 27. 1974 Inv ent0r(s) Gerald W. Schmidt et al It is certified that error appears in the above-identified patent and that said Letters Patentare hereby corrected as shown below:

Column 8, line 14, after "ing", insert "with the container whereby at least a portion of".

Signed 'and sealed this 3rd day of December 1974.

(SEAL) Attest:

McCOY M. GIBSON JR. c. MARSHALL DANN Attesting Officer Commissioner of Patents FORM PC4050 (10'69) USCOMM-DC 50376-P69 LLS. GOVERNMENT PRINTING OFFICE I869 0-356-384.

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Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4190056 *Oct 31, 1977Feb 26, 1980General Medical CompanyMethod and means for recording sweat gland activity
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Classifications
U.S. Classification118/31.5, 399/267, 118/57
International ClassificationA61B5/117
Cooperative ClassificationA61B5/1172
European ClassificationA61B5/117B