|Publication number||US3399425 A|
|Publication date||Sep 3, 1968|
|Filing date||Aug 23, 1966|
|Priority date||Aug 23, 1966|
|Publication number||US 3399425 A, US 3399425A, US-A-3399425, US3399425 A, US3399425A|
|Inventors||Jerome H Lemclson|
|Original Assignee||Jerome H. Lemelson|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (13), Referenced by (54), Classifications (18)|
|External Links: USPTO, USPTO Assignment, Espacenet|
Sept. 3, 1968 J. H. LEMELSON 3,399,425
APPARATUS FOR SURFACE FORMING MATERIALS Filed Aug. 23, 1966 6 I NVENTOR.
Jerome H.Lemelson United States Patent 3,399,425 APPARATUS FOR SURFACE FORMING MATERIALS Jerome H. Lemelson, 85 Rector St., Metuchen, NJ. 08840 Continuation-impart of application Ser. No. 249,921, Jan. 7, 1963. This application Aug. 23, 1966, Ser. No. 574,416
6 Claims. (Cl. 18--10) This invention relates to improvements in sheet materials and methods for producing same and is a continuation-in-part of my copending application Ser. No. 249,921 filed on Jan. 7, 1963, entitled, Plastic Sheet and Method, and having as a parent application Ser. No. 410,489 filed on Feb. 16, 1954.
Various articles of manufacture such as textile articles and the like are produced of sheet material having a pile or fur-like surface which is operative to impart resiliency, softness of touch, insulation characteristics and the like to said material and to render same with improved physical characteristics. Such sheet materials are generally produced by relatively complex procedures involving the formation and attachment of a multitude of fibers or filaments by adhesive or other means to a web of textile material and often the lamination of said web to further web. Such procedures are costly and timeconsuming and frequently result in the production of a pile fabric or the like which is limited in its application and has numerous shortcomings.
This invention is primarily concerned with the production of structures in sheet materials having a multiplicity of filament-like elements protruding from major surface of the sheet and integrally formed of the material of the substrate from which they protrude. It is, accordingly, a primary object of this invention to provide a new and improved structure in a sheet material having a multiplicity of elements protruding from a surface of said sheet.
Another object is to provide a sheet material having a pile or spring surface structure which is produced by mechanical means directly on the surface of the sheet material from the material itself.
Another object is to provide a new and improved structure in a sheet material having a pile-like surface of hook shaped elements formed of the material of the surface strata of said sheet material and capable of retentively engaging itself or sheet materials with filamental loop formations therein.
Another object is to provide a new and improved structure in a material having a multitude of filamental loop-like formations provided in a surface thereof capable of fastening said sheet to a hooking material.
Another object is to provide new and improved apparatus for producing sheet materials having a multiplicity of filament-like formations or otherwise shaped protrusions formed in the surface of the sheet materials.
Another object is to provide a new and improved method for producing tufted or filamented sheet materials by deforming or molding molten plastic forming at least part of said materials.
With the above and other such objects in view as may hereinafter more fully appear, the invention consists of the novel constructions, combinations and arrangements of parts as Well as methods of fabrication which will be hereinafter more fully described and illustrated in the accompanying drawings, but it is to be understood that changes, variations and modifications may be resorted to which fall within the scope of the invention as claimed.
Patented Sept. 3, 1968 In the drawings which form part of the description:
FIG. 1 is a schematic representation of an apparatus for continuously producing a sheet of material having a filamental or pile-like surface by continuously deforming said surface while in a molten condition;
FIG. 2 shows in side view, a modified form of the apparatus disclosed in FIG. 1;
FIG. 3 is an end view of a fragment of material producible by means of apparatus of the type illustrated in FIGS. 1 and 2;
FIG. 4 is an end view of a fragment of a modified form of the material shown in FIG. 3;
FIG. 5 is an end view of a fragment of another modified form of material producible by means of apparatus of the type shown in FIGS. 1 and 2;
FIG. 6 is an end view of a fragment of sheet material having a plurality of loop-like formations or filaments formed integral with or bonded to the surface of said sheet;
FIG. 7 is a schematic representation of a modified ap paratus applicable to the apparatus illustrated in FIG. 1 for producing a tufted or spiny surface in a sheet of formable plastic material, and
FIG. 8 is an end view of a modified form of apparatus of the type illustrated in FIGS. 1 and 2.
This invention is primarily concerned with the fabrication of new and improved sheet materials having at least one major surface formed with a multitude of individual formations protruding outwardly from said surface and preferably made of the material of the sheet or the surface strata thereof from which they protrude. In preferred forms of the invention, the sheet or portion thereof from which the individual formations protrude, is a flexible polymer such as vinyl, polyethylene, ethylene vinyl acetate or the like and the surface protrusions are filament-like in shape and closely spaced to provide a tufted or pile-like surface which is flexible and soft to the touch permitting use of the sheet against the human skin or springy in nature permitting the sheet to be used for many packaging, sound and vibration damping purposes, etc. The apparatus provided hereafter or modified versions thereof, may be used to produce sheet materials with protrusions of filament-like formations which vary from a few thousandths of an inch in diameter to or greater in diameter and in length from about to A" or more depending on the application. The filament-like formations may be used as formed, trimmed by automatic means, curled or deflected or otherwise changed in shape downstream of the apparatus illustrated.
FIG. 1 illustrates an apparatus 10 for producing a sheet of material containing surface protruding formations such as spines or filaments on a continuous basis. The apparatus 19 includes extrusion means 11 for continuously forming a sheet 12 of thermoplastic material and feeding same directly against a processing roll or drum 18 which provides the desired surface formations 12 in at least one surface of the freshly formed sheet just after it emerges from the extruder 11 and is in a molten and easily formable condition. The sheet 12 is fed directly to the upper surface of the belt 14 of an endless belt conveyor 13 which is power operated to drive the belt 14 at substantially the speed of the extruding sheet and which belt is guided by a plurality of rollers 15, 16, 17 to retain sheet 12 against a portion of the peripheral surface 19' of a power rotated drum or roller 18 adapted to predeterminately form a plurality of spines or filaments 12a in the surface of sheet 12 and across said surface before the sheet is removed therefrom.
Situated beyond the forming apparatus 13, 18 are a plurality of rollers 21 and 23 which are operative to deflect the formations 12a in the surface 12 of sheet 12 to provide formations thereof as will be hereinafter described. Notations 22 and 24 refer to the power operated shafts of rollers 21 and 23 and to the power rotated shaft of drum 18. Located downstream of the forming means 21, 23 is a cutting apparatus 25 including a blade 26 driven by a servo device 27 such as a solenoid to cooperate with a second blade 28 in cutting predetermined lengths of sheet 12 without stopping the continuous process described.
Notation 29 refers to a heater such as a radiant heating element disposed immediately above sheet 12 for rendering the surface strata thereof to be deformed, molten just prior to engagement with the forming surface 19' of drum 18. Depending on the nature of the material being extruded to form sheet 12, the distance between the extruder 11 and the forming apparatus, the operating characteristics of said apparatus and the speed at which said material is extruded, the heating means 29 may or may not be required to render said sheet in a condition for forming same with a plurality of protruding spiny or filamental elements as will be hereafter described.
A number of techniques may be used for forming the molten surface of the sheet 12 and include the provision of short narrow needles or pin-like protrusions 20 extending outwardly from the main cylindrical surface 19' of the drum 18. The protruding elements 20 are forced into the molten material and each serve to pull a quantity of molten plastic out of the molten strata thereof into which the elements have been projected as the sheet 12 is removed from the surface 19' of the drum 18. By properly controlling the temperature of the plastic material comprising sheet 12, material in the shape of tapered spiny formations or filaments 12a protruding from the surface 12' may be formed as an integral extension of the base sheet 12 which filaments 1201 may be caused to solidify and retain either their shape as formed or a modification thereof. Accordingly, means such as one or more nozzles 29' may be employed to direct a heat transfer fluid such as air or liquid against either or both surfaces of sheet 12 after it is guided away from drum 18 to solidify or fuse same before the formations 12a have had an opportunity to sink back into the sheet 12. Again need for the coolant nozzles 29' may be eliminated depending on the condition of the sheet 12 upon leaving drum 18, its attitude with respect to the horizontal and the shape desired of the elements protruding from the surface 12'.
In one mode of operation, the belt 14 of conveyor 13 may be cooled by means of air or water sprays while drum 18 may be heated to render the surface strata of sheet 12 molten. The sheet 12 may thus also be fed from a roll and comprise thermoplastic material per se, or a lamination of thermoplastic material and another material such as another polymer, textile material, woven fabric, non-woven fabric, metal, paperboard, foamed plastic or other suitable base which may be roll fed and laminated to or extrusion coated with the material comprising the formable sheet 12.
While the sheet forming apparatus 10 of FIG. 1 includes a forming roll and endless conveyor which cooperate in forming sheet 12, said apparatus may also comprise two endless conveyor bels or two power driven rollers between which the sheet 12 is driven and one of which contains protruding pin-like formations or otherwiseshaped irregular formations which are operative to each pull a small quantity of molten material from the surface strata as described. Furthermore, reciprocating platen means with pin-like protrusions may also be employed to form the sheet as described.
The apparatus of FIG. 1 may also contain a plurality of the drum and belt forming means 13, 18 of FIG. 1 75 longitudinally disposed to receive the sheet being formed one after the other so as to provide a greater density of surface formations 12a in the sheet 12. In other words, one surface forming drum and belt means for retaining the sheet against it peripheral surface may first operate on a first surface of the sheet to form a first array of spaced apart protruding filaments therein while the second forming drum situated downstream of the first drum operates on portions of the surface of the sheet between the filaments formed by the first drum to form said unformed portions into other filaments of the same or different in shape than the first formed filaments.
There is shown in FIG. 2 a modified form of the apparatus of FIG. 1 for producing a sheet material having a tufted or filamented surface layer defined by a plurality of filaments made of the material of at least a portion of the sheet. The apparatus includes a first rotating roll or drum 18 having a second rotating roll or drum 43 cooperating therewith in receiving and driving a sheet 50 therebetween. The material 50 may comprise a single sheet of material such as a thermoplastic polymer capable of being formed while at least a portion thereof is in a semi-molten condition. The sheet 50 illustrated in FIG. 2 comprises a multi-strata material including a base sheet or web 51 the lower surface 52 of which is engaged by the lower rotating drum 43. Disposed against and laminated or coated on the upper surface of base sheet 51 is a layer or sheet 53 of thermoplastic material having an upper surface 54 which faces the surface 19' of the drum 18 and preferably, although not necessarily, is compressively engaged thereby,
Disposed in a plurality of radial holes 44 extending into the wall 19 of drum 18 are a plurality of rods 0r pointed pins which project a short distance outwardly from surface and are operative to penetrate the thermoplasic material preferably while said material is in a molten or semi-molten condition. The needles 45 preferably are closely spaced across substantially the entire peripheral surface 19' of drum 18 or at least that portion of said drum which is desired to effect the formation of filaments of the surface layer of the material fed thereagainst.
As the sheet material leaves the surface of drum 18, the needles serve to each draw a small amount of molten or semi-molten material from the surface 54 of the feeding member or sheet 53 as illustrated by the partially drawn filament-like formations 55 and 55'. At a certain point beyond the drum 18, the drawn material separates from the pin 45 which is drawing same leaving a filament-like formation 55' protruding outwardly from the surface 54. Depending on the thermoplastic polymer comprising sheet 50 or layer 53, control of the temperature gradient of said material from its location just prior to being fed to the bite of drums 18 and 43 to the location where the formations 55' separate from the pins 45 and beyond said location, will result in the formation of filaments of substantially predetermined shapes resulting in a web of material having a filamented surface suitable for various useful applications which will depend on the characteristics of the material so formed. If, for example, the material comprising member 50 or surface layer 53 is a flexible polymer such as plasticized polyvinyl chloride, low or medium density polyethylene, polypropylene, ethylene vinyl acetate or other suitable polymer or copolymer, the web material 50 may be utilized for various applications ranging from its use as a textile material in the production of clothing or other flexible articles, mats, floor or ground coverings such as rugs, artificial grass or the like, heat scalable components of inflatable articles, vibration dampening or packaging material, etc. If the material 50 or layer 53 thereof is semi-rigid or rigid in nature, the spinelike protrusions 54 may be used as brushing, scouring, friction-producing, abrasive or brushing elements of a belt, plate or otherwise shaped article made therefrom.
If the sheet 50 is produced of a lamination or multilayer formation of different materials, the base 51 may comprise a woven or non-woven fabric, flexible or rigid material such as plastic, paper, paperboard, metal or other sheet material which is coated with or laminated to the layer 53.
The apparatus of FIG. 2 preferably includes means for rendering the layer 53 or the upper strata thereof in a molten condition permitting the drawing of the filamentlike formations 55 outwardly from the surface 54 as described. Accordingly, a suitable radiant heating means may be disposed on the upstream side of the drum 18 for rendering said plastic material molten. The dnum 18 may also be heated by any suitable means so as to conduct and/ or radiate heat to render a sufficient portion of the material 50 in a molten condition to permit the described formation of the upper surface thereof. In one form of the invention, the rolls or drums 18 and 43 may comprise components of a calendering apparatus operative to receive for-mable thermoplastic material and to form same into a sheet having one flat surface and the other surface containing a plurality of integral filaments or spiny formations as described.
In another form of the invention, the rolls 41 and 43 may be operative to receive a sheet of freshly extruded thermoplastic material formed per se or extrusion coated on or laminated to a second sheet such as 51 of FIG. 2 just prior to feeding same to the bite of the rolls 18 and 43. Accordingly, such extrusion may be carried out in a manner to provide layer 53 in a molten condition by the time the material reaches the forming apparatus so that it will not be necessary to heat the roll 18 or the material 53 just prior to entering the forming apparatus. Depending on the nature of the material being formed, it may be desirable to guide the sheet formation 53 so as to remain against an extended portion of the surface of drum 18 wherein said material will be rendered molten for the intended purpose.
FIG. 3 illustrates a fragment of a first form of sheet material 30a produced by apparatus of the type shown in FIGS. 1 and 2. The base sheet 31a is provided of any suitable flexible or rigid polymer and has formed integral therewith a plurality of closely spaced, substantially straight upwardly extending and slightly tapered filamentlike formations 3241 which extend over a substantial portion of the width of sheet 31a. The material 30a may be used for various different purposes depending on the flexibility of said material. The formations 32a may be rigid or semi-rigid and may serve such purposes as brushing elements, vibration damping means, packaging material and the like. More flexible formulations of thermoplastic materials utilized to form the member 30a may render said member suitable for use as carpeting, product trim or the like. The base 31a may also be made of a lamination or otherwise formed composite web as described.
In FIG. 4 is shown a modified form of the material illustrated in FIG. 3 which comprises a sheet-like formation30b having a base portion 31b and a plurality of filament-like elements 321; the upper ends of which are curled exposing a greater portion of the side surfaces thereof and providing a different surface than provided by the formation of FIG. 3. The upper ourled ends of elements 322: may be randomly or uniformly directed and may be a natural shape resulting from when the formations 32b pull away from the pins or needles used for forming same as illustrated in FIG. 2. If the material comprising formations 32b of FIG. 4 is rigid or semi-rigid plastic, said material may be utilized as a so-called hooking material wherein the looped or curled ends 32b of the formations 32b will hook and hold a plurality of similar formations in another sheet thereof or modified forms of loops or broken hooks so as to serve as a fastener.
In FIG. 5 is shown a fragment of a modified form or filamented material 300 producible by means of apparatus of the type illustrated in FIG. 1. The filament-like formations 32c which extend outwardly from the base sheet 300 extend oblique to said surface in somewhat of a flattened or partially-flattened condition giving the effect of grass or hair formations. The formations 320 of FIG. 5 are produced by either guiding the sheet formed by the apparatus of FIG. 1 between a plurality of rollers either prior to solidification of the material thereof after it is driven from the apparatus 13, 18, molten or by reheating the surface 12a of the filamented material and deflecting the filament elements 32 by means of a blast of a suitable fluid such as air or by passing same between rollers which are operative to deflect and permanently deform the elements 32 as illustrated.
In FIG. 6, a web or sheet 30d of material is formed as described and comprises a base sheet portion 31d from which upwardly protrudes a plurality of filament-like elements 33d which have been formed in the upper surface 32d of the sheet 31d as described. The formations 3312?, after being formed, are either forced or permitted to droop by gravity before they completely solidify so that'the end portions of each become welded to or fuse with the upper strata or surface layer of the material comprising sheet 30d. Notation 34 refers to the welded or integrally bonded end portions of the filament-like formations 33a. The surface of sheet member 31d is thus comprised of a plurality of loop formations defined by the filament-like formations 33d which have been drawn from or molded integral with the sheet. Such a structure may be used for abrading or scouring purposes. In still another application, the structure illustrated in FIG. 6 may be used as a component of a fastener system having another component shaped as in FIG. 4 and having a plurality of hook-like formations similar to 32b with hooklike or curled ends 32b adapted to engage and hook the loop-formations 33d of FIG. 6 across the mating surfaces.
In another embodiment, it is noted that one or more sinusoidally formed filaments or wires of plastic or metal with a plurality of U-shaped loop-like formations therein, may be embedded in a molten sheet formation, upper strata or coating on a base sheet and retained thereagainst upon solidification of said molten material to provide substantially the structure illustrated in FIG. 6 which may be used for scouring purposes or as a component of a hooking material fastener as described.
FIG. 7 illustrates a portion of sheet forming apparatus similar to that illustrated in FIG. 1 but modified as to the means for forming the spine or filament-like formations in the sheet material. The apparatus 60 includes, in addition to means as described for supplying a sheet 12 of molten thermoplastic material or a lamination including same, to the space between a power operated roller or drum 61 and the belt 14 of an endless belt conveyor 13 which is operative to receive said sheet and compressively retain same against the cylindrical peripheral surface 64 of the wall 63 of drum 61. Radially provided through the wall 63 of drum 61 are a multitude of small holes 65 into each of which is forced a sufficient quantity of the molten sheet compressed against the drum or the molten upper strata sheet material being formed. Fine capillary holes 66 may be provided between the inner ends of the radial holes 65 which holes 66 extend to the inside surface 64 of the wall 63. Thus, if the interior 62 of drum 61 is connected to a source of negative pressure or vacuum, such as a vacuum pump, molten material from sheet 12 will be drawn by vacuum into the radial holes 65 to facilitate the formation of said spine or filament formations protruding from the surface of the sheet being formed. Accordingly, a vacuum pump system may be connected through a passageway in the axle or shaft on which drum 61 rotates to the interior volume 62 of the drum for providing negative pressure therein which will assist in drawing molten material into the radial cavities 65 extending from the outer surface 64 of the drum.
Depending on the characteristics of the material being formed, it may suffice to guide the conveyor belt 14 away from the surface 64 of drum 61 while the material in the cavities 65 is in a molten or semi-molten condition which may serve to further elongate the filaments before the material thereof is completely removed from said cavities as the sheet 12 is drawn further away from the drum 61. In other forms of the invention, the wall 64 of the drum may be cooled to facilitate and hasten solidification of the material forced into the cavities 65 and/or a coolant gas or liquid may be directed against belt 14 to further hasten solidification of the molten portions being formed.
The capillary holes 66 are preferably of such a dimension as to prevent the molten or semi-molten material entering the larger diameter holes 65 from passing through said capillary ducts 66.
In another form of the invention, the radial holes 65 may extend completely through the solid wall portion 63 of the drum and a liner of porous metal may cover the inside surface of the drum wall 63 and prevent the escape of molten material to the interior volume 62. In a preferred embodiment, the holes 65 are coated with a lowfriction material such as Teflon or are highly polished and extend only partly through the wall 63 so that the filament or spine-like formations are formed entirely as the result of pressure exerted by belt 14 against the molten sheet material forcing portions of said material into the cavities 65 which portions become solidified therein as the drum rotates and are removed from each cavity as the sheet material 12 is drawn away from the surface 64 of the drum 61 as described.
FIG. 8 illustrates a modified form of the invention wherein the sheet forming drum is modified to form a plurality of different sheet materials with surface formations which are modified forms of the previously de scribed structures. The apparatus 70 includes, in addition to features hereinabove described, a pair of cooperating rollers or drums 73 and 74 adapted to receive a sheet 75 of material to be formed between said rollers. Protruding outwardly from the surface 73 of the roller 71 and preferably extending across said surface about the complete periphery of the roller are a multitude of formations or elements 72 defining sharp teeth of wedge-like shape. Said teeth 72 are each adapted to be driven into the surface 76 of sheet 75 as the sheet is compressively driven through the rollers and, as the sheet 75 emerges from the rollers, to lift outwardly from said sheet and form a plurality of tapered formations 77 which protrude outwardly from said sheet as illustrated. The formations 77 may remain in the shape they are formed or may be further worked by automatically operating means situated downstream of the rollers 71 and 74 which may operate to deflect, curl, trim, grind or otherwise form same.
The sheet 75 may comprise a thermoplastic or thermosetting polymer, ceramic, metal or other suitable material or composite or laminate. Said sheet may be fed to the power driven rollers 71, 74 as extruded or rolled in a softened or molten condition or in a fully solidified state. Depending on the material of sheet 75, the tooth-like formations 77 therein may be used to impart resiliency to the surface 76 particularly if the material comprising said sheet is a resilient or medium density polymer such as polyethylene, polypropylene or the like, or in the event that the material is metal or ceramic, may be used for abrading purposes or to enhance the adhesion or mechanical bonding of the surface 76 to other materials.
The teeth 72 protruding from surface 73 of drum 71 may be formed in the wall of the drum by the means described for forming sheet 75 prior to assembly of the drum, may be cast integral with said wall or may comprise teeth of a hard material such as titanium carbide, aluminum oxide or the like welded to or cast integral with the drum wall.
In a preferred form of the invention, sheet 75 may comprise a sheet of metal such as aluminum with the formations 77 having sharp edges and used for abrading purposes. If the sheet 75 is a thermoplastic material or metal provided in a molten condition at the bite of the rollers, the formations 77 may be drawn upwardly and curled in shape by the action of the teeth 72 which each serve to pull material off the surface of the sheet. The sheet 75 may also be driven by a pair of rollers or other means disposed downstream and/ or upstream of the rollers 71, 74 at such a speed, lower than the rotational velocity of the surfaces of drums 71 and 74 to permit the teeth 72 to draw the formations 77 a greater degree outwardly from the sheet than if the sheet were travelling at the same speed as the drum 71.
1. Apparatus for producing a tufted sheet material or the like comprising:
(a) means for supplying a sheet of formable material,
(b) sheet deforming means for continuously operating on said sheet material to provide a plurality of spine or filament-like formations of the material of said sheet with said formations protruding outwardly from a surface of said sheet,
(0) means for continuously feeding said sheet to said forming means,
(d) means for providing at least a portion of said sheet in a molten condition whereby said sheet deforming means may shape said molten portion with said filament-like formations, and
(e) means for operating on said filament-like formations after they have been formed by said sheet deforming means to permanently deform said formations to a shape other than that to which they are first formed by said sheet deforming means.
2. An apparatus in accordance with claim 1 wherein said sheet deforming means includes a movable base having a plurality of cavities, means for causing molten material from said sheet to flow into said cavities to shape the surface of said sheet to contain said filament-like formations, protruding therefrom.
3. Apparatus in accordance with claim 2 wherein said movable base comprises a drum and said cavities are elongated, radial holes in the peripheral surface of said drum for forming filament-like protrusions of the material of said sheet.
4. Apparatus in accordance with claim 1 whereby said sheet deforming means includes a member having a plurality of relatively narrow, elongated elements arranged with their free ends adapted to be plunged into the molten surface of said sheet, means for guiding and driving said sheet past said member containing said narrow elements and means for causing the ends of said narrow elements to first penetrate the molten surface of said sheet and thereafter each draw a quantity of molten material out of the sheet forming said filament-like formations in the surface of said sheet.
5. Apparatus in accordance with claim 1 whereby said means for operating on said filament-like formations after they have been formed by said sheet deforming means comprises roller means operative to receive the sheet and permanently deform said filament-like formations.
6. Apparatus for producing a material having filamentlike surface formations comprising in combination:
(a) means for continuously forming and feeding a first deformable material,
(b) deforming means for continuously operating on said first material to provide a plurality of filamentlike formations of the material with said filamentlike formations protruding outwardly from a surface thereof,
(c) means for providing at least a portion of said material in a molten condition whereby said deforming means may easily shape said molten portion, and
((1) means for operating on said filament-like forma- References Cited UNITED STATES PATENTS Simon 1810 Unokichi et a1. 1810 Conrad 1810 Wisotzky.
Pashke 1810 Gelpke 18-10 Gathmann 1810 Maxin 1810 Roberts 181 Berry 1810 Winneke 264284 Sternberger 264284 Robert et a1. 1810 10 WILLIAM J. STEPHENSON, Primary Examiner.
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|U.S. Classification||425/327, 425/110, 425/511, 26/2.00R, 425/514, 425/DIG.370, 425/385, 425/373, 425/516, 425/504, 425/379.1, 28/159, 264/280, 425/307|
|Cooperative Classification||Y10S425/037, A44B18/0049|