US20010041465A1 - Z-axis electrical interconnect - Google Patents
Z-axis electrical interconnect Download PDFInfo
- Publication number
- US20010041465A1 US20010041465A1 US09/277,894 US27789499A US2001041465A1 US 20010041465 A1 US20010041465 A1 US 20010041465A1 US 27789499 A US27789499 A US 27789499A US 2001041465 A1 US2001041465 A1 US 2001041465A1
- Authority
- US
- United States
- Prior art keywords
- printed circuit
- flexible printed
- electrical interconnect
- axis electrical
- set forth
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/02—Contact members
- H01R13/22—Contacts for co-operating by abutting
- H01R13/24—Contacts for co-operating by abutting resilient; resiliently-mounted
- H01R13/2435—Contacts for co-operating by abutting resilient; resiliently-mounted with opposite contact points, e.g. C beam
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R12/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, specially adapted for printed circuits, e.g. printed circuit boards [PCB], flat or ribbon cables, or like generally planar structures, e.g. terminal strips, terminal blocks; Coupling devices specially adapted for printed circuits, flat or ribbon cables, or like generally planar structures; Terminals specially adapted for contact with, or insertion into, printed circuits, flat or ribbon cables, or like generally planar structures
- H01R12/50—Fixed connections
- H01R12/59—Fixed connections for flexible printed circuits, flat or ribbon cables or like structures
- H01R12/62—Fixed connections for flexible printed circuits, flat or ribbon cables or like structures connecting to rigid printed circuits or like structures
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R12/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, specially adapted for printed circuits, e.g. printed circuit boards [PCB], flat or ribbon cables, or like generally planar structures, e.g. terminal strips, terminal blocks; Coupling devices specially adapted for printed circuits, flat or ribbon cables, or like generally planar structures; Terminals specially adapted for contact with, or insertion into, printed circuits, flat or ribbon cables, or like generally planar structures
- H01R12/70—Coupling devices
- H01R12/71—Coupling devices for rigid printing circuits or like structures
- H01R12/712—Coupling devices for rigid printing circuits or like structures co-operating with the surface of the printed circuit or with a coupling device exclusively provided on the surface of the printed circuit
- H01R12/714—Coupling devices for rigid printing circuits or like structures co-operating with the surface of the printed circuit or with a coupling device exclusively provided on the surface of the printed circuit with contacts abutting directly the printed circuit; Button contacts therefore provided on the printed circuit
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/02—Contact members
- H01R13/22—Contacts for co-operating by abutting
- H01R13/24—Contacts for co-operating by abutting resilient; resiliently-mounted
- H01R13/2464—Contacts for co-operating by abutting resilient; resiliently-mounted characterized by the contact point
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/36—Assembling printed circuits with other printed circuits
- H05K3/368—Assembling printed circuits with other printed circuits parallel to each other
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/03—Conductive materials
- H05K2201/0332—Structure of the conductor
- H05K2201/0364—Conductor shape
- H05K2201/0367—Metallic bump or raised conductor not used as solder bump
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/05—Flexible printed circuits [FPCs]
- H05K2201/056—Folded around rigid support or component
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/36—Assembling printed circuits with other printed circuits
- H05K3/361—Assembling flexible printed circuits with other printed circuits
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/36—Assembling printed circuits with other printed circuits
- H05K3/361—Assembling flexible printed circuits with other printed circuits
- H05K3/365—Assembling flexible printed circuits with other printed circuits by abutting, i.e. without alloying process
Definitions
- the present invention relates generally to electrical interconnects and, more particularly, to a Z-axis electrical interconnect.
- Electronic devices are commonly made up of individual components electrically connected together to form a single electrical circuit.
- An example of an electrical component known in the art is a printed circuit board.
- Another example is a flexible printed circuit, also known as a flexible circuit.
- Still another example is an integrated circuit or IC chip.
- Commonly known electrical interconnection techniques include soldering, socketing, wire bonding, wire button contacts and plug-in connectors.
- stacked electrical components necessitate the use of a Z-axis electrical interconnect.
- a wire button contact was used.
- a disadvantage of a wire button contact as a Z-axis electrical interconnect is that it requires a strict vertical dimensional tolerance between the stacked electrical components.
- Another disadvantage is that the wire button electrical interconnect may not fit in a low profile space.
- the present invention is a Z axis electrical interconnect.
- the Z-axis electrical interconnect includes a flexible printed circuit folded into a U-shape.
- the Z-axis electrical interconnect also includes a plurality of raised interconnection members arranged on the flexible printed circuit in a predetermined pattern and a circuit trace interconnecting the raised interconnection members.
- the Z-axis electrical interconnect further includes a spring fixedly positioned on the flexible printed circuit to maintain the U-shape.
- One advantage of the present invention is that a Z-axis electrical interconnect is provided having a low profile to fit within a limited space. Another advantage of the present invention is that the Z-axis electrical interconnect allows a lower insertion force during installation. Still another advantage of the present invention is that the Z-axis electrical interconnect provides a positive contact in interconnecting stacked electrical components having a large vertical tolerance. A further advantage of the present invention is that the Z-axis electrical interconnect has connections which may also be tailored to have different locations between the two boards, i.e., a smaller pitch on one board and a larger pitch on the other board, because the signal carrying element is built on a flexible printed circuit (FPC).
- FPC flexible printed circuit
- FIG. 1 is a perspective view of a Z-axis electrical interconnect illustrating features of the present invention.
- FIG. 2 is a side view of the Z-axis electrical interconnect of FIG. 1.
- FIG. 3 is a perspective view of an installed Z-axis electrical interconnect.
- FIG. 4 is a perspective view of another embodiment of an installed Z-axis electrical interconnect.
- the Z-axis electrical interconnect 10 includes a flexible printed circuit such as a flexible circuit 12 .
- the flexible circuit 12 is a mandrel built flexible circuit.
- a circuit (not shown) is imaged on the mandrel (not shown) in photoresist.
- the circuit is plated with a conductive material, such as copper.
- the resist is stripped off of the mandrel.
- a coverlet film is laminated over the circuit on the mandrel.
- Kapton Kapton
- the Z-axis electrical interconnect 10 includes a raised interconnection member 14 protruding from the flexible circuit 12 .
- the raised interconnection member 14 is a bump made from an electrically conductive material such as copper.
- the Z-axis electrical interconnect 10 includes a plurality of raised interconnection members 14 arranged in a predetermined pattern.
- the predetermined pattern is a row of raised interconnection members 14 positioned along a proximate end 16 and a distal end 18 of the flexible circuit 12 .
- the raised interconnection member 14 provides a removable electrical contact between stacked first and second electrical devices 20 , 22 as illustrated in FIG. 3.
- the stacked electrical devices 20 , 22 may be printed circuit boards.
- the Z-axis electrical interconnect 10 also includes a circuit trace 24 positioned on a surface of the flexible circuit 12 .
- the circuit trace 24 electrically connects the raised interconnection member 14 at the proximate end 16 of the flexible circuit 12 with the corresponding raised interconnection member 14 at the distal end 18 of the flexible circuit 12 . It should also be appreciated that, because the Z-axis electrical interconnect 10 has a flexible circuit 12 , the interconnect 10 can be tailored to have custom mating locations and raised interconnection members 14 on multiple rows.
- the Z-axis electrical interconnect 10 is folded into a U-shape, with the raised interconnection member 14 facing outwardly.
- the Z-axis electrical interconnect 10 includes a spring 26 fixedly positioned between the proximate and distal ends 16 , 18 of the folded flexible circuit 12 .
- the spring 26 is bonded to the flexible circuit 12 , such as with an adhesive.
- the spring 12 is elastomeric so as to maintain the shape of the Z-axis electrical interconnect 10 while providing conformity and pressure to the raised interconnection members 14 when in contact with the first and second electrical devices 20 , 22 .
- the Z-axis electrical interconnect 10 requires a minimal insertion force to install and maintain contact between the stacked first and second electrical devices 20 , 22 .
- the Z-axis electrical interconnect 10 is fixedly retained between the stacked first and second electrical devices 20 , 22 .
- the Z-axis electrical interconnect 10 may be retained on the electrical devices 20 , 22 by known techniques such as soldering, bonding or fixturing. An example of fixturing is shown in FIG. 4.
- the Z-axis electrical interconnect 10 includes a tab 28 extending from the flexible circuit 12 , such as from a side. Preferably, two tabs 28 are used, although there could be as many as four tabs 28 .
- the Z-axis electrical interconnect 10 is positioned such that the raised interconnection member 14 is aligned with a mating contact (not shown) on the first electrical device 20 .
- the tab 28 is aligned with a corresponding slit 30 in the first electrical device 20 , inserted into the slit 30 , and fixedly retained, such as by folding the tab 28 over.
- the tab 28 may also be bonded by an adhesive 31 to the first electrical device 20 to secure the Z-axis electrical interconnect 10 to the first electrical device 20 .
- FIG. 2 Still another example of fixturing is illustrated in FIG. 2.
- solder 32 is used to secure the raised interconnection members 14 onto the first electrical device 20 . It should be appreciated that conventional pick and place machines can automate this activity in large volumes.
- the Z-axis electrical interconnect 10 is connected to the second electrical device 22 in a similar manner.
Abstract
A Z-axis electrical interconnect includes a flexible printed circuit folded into a U-shape. The Z-axis electrical interconnect also includes a plurality of raised interconnection members arranged on the flexible printed circuit in a predetermined pattern and a circuit trace interconnecting the pair of raised interconnection members. The Z-axis electrical interconnect further includes a spring fixedly positioned on the flexible printed circuit to maintain the U-shape.
Description
- The present invention relates generally to electrical interconnects and, more particularly, to a Z-axis electrical interconnect.
- Electronic devices are commonly made up of individual components electrically connected together to form a single electrical circuit. An example of an electrical component known in the art is a printed circuit board. Another example is a flexible printed circuit, also known as a flexible circuit. Still another example is an integrated circuit or IC chip. Frequently, it is desirable to connect individual electrical components together. Commonly known electrical interconnection techniques include soldering, socketing, wire bonding, wire button contacts and plug-in connectors.
- As electronic devices physically decrease in size, packaging constraints may limit the use of traditional electrical interconnection techniques.
- For example, stacked electrical components necessitate the use of a Z-axis electrical interconnect. In the past, a wire button contact was used. However, a disadvantage of a wire button contact as a Z-axis electrical interconnect is that it requires a strict vertical dimensional tolerance between the stacked electrical components. Another disadvantage is that the wire button electrical interconnect may not fit in a low profile space. Thus, there is a need in the art for a Z-axis electrical interconnect that is packagable within a low profile space and provides a more positive electrical contact in interconnecting electrical devices.
- Accordingly, the present invention is a Z axis electrical interconnect. The Z-axis electrical interconnect includes a flexible printed circuit folded into a U-shape. The Z-axis electrical interconnect also includes a plurality of raised interconnection members arranged on the flexible printed circuit in a predetermined pattern and a circuit trace interconnecting the raised interconnection members. The Z-axis electrical interconnect further includes a spring fixedly positioned on the flexible printed circuit to maintain the U-shape.
- One advantage of the present invention is that a Z-axis electrical interconnect is provided having a low profile to fit within a limited space. Another advantage of the present invention is that the Z-axis electrical interconnect allows a lower insertion force during installation. Still another advantage of the present invention is that the Z-axis electrical interconnect provides a positive contact in interconnecting stacked electrical components having a large vertical tolerance. A further advantage of the present invention is that the Z-axis electrical interconnect has connections which may also be tailored to have different locations between the two boards, i.e., a smaller pitch on one board and a larger pitch on the other board, because the signal carrying element is built on a flexible printed circuit (FPC).
- Other features and advantages of the present invention will be readily appreciated as the same becomes better understood after reading the subsequent description when considered in connection with the accompanying drawings.
- FIG. 1 is a perspective view of a Z-axis electrical interconnect illustrating features of the present invention.
- FIG. 2 is a side view of the Z-axis electrical interconnect of FIG. 1.
- FIG. 3 is a perspective view of an installed Z-axis electrical interconnect.
- FIG. 4 is a perspective view of another embodiment of an installed Z-axis electrical interconnect.
- Referring to FIGS. 1, 2 and3, one embodiment of a Z-axis
electrical interconnect 10 is illustrated. The Z-axiselectrical interconnect 10 includes a flexible printed circuit such as aflexible circuit 12. It should be appreciated that, in this example, theflexible circuit 12 is a mandrel built flexible circuit. For example, to construct a mandrel built flexible circuit 12 a circuit (not shown) is imaged on the mandrel (not shown) in photoresist. The circuit is plated with a conductive material, such as copper. The resist is stripped off of the mandrel. A coverlet film is laminated over the circuit on the mandrel. An example of such a film is a material known as Kapton. While still on the mandrel, a layer of a conductive material such as nickel and a layer of gold is plated onto the pad using the coverlet as a plating resist. The flex is then removed from the mandrel, exposing the circuit traces on the other side of the circuit. A layer of electroless gold or tin-lead may be plated onto the nickel surface to establish a solderable surface. A further example of how this type offlexible circuit 12 is constructed is disclosed in a commonly assigned U.S. Pat. No. 5,207,887 to Crumly, et al., which issued on May 4, 1993, entitled “Semi-Additive Circuitry With Raised Features Using Formed Mandrels”, the disclosure of which is hereby incorporated by reference. - The Z-axis
electrical interconnect 10 includes a raisedinterconnection member 14 protruding from theflexible circuit 12. The raisedinterconnection member 14 is a bump made from an electrically conductive material such as copper. Preferably, the Z-axiselectrical interconnect 10 includes a plurality of raisedinterconnection members 14 arranged in a predetermined pattern. In this example, the predetermined pattern is a row of raisedinterconnection members 14 positioned along aproximate end 16 and adistal end 18 of theflexible circuit 12. It should be appreciated that the raisedinterconnection member 14 provides a removable electrical contact between stacked first and secondelectrical devices electrical devices - The Z-axis
electrical interconnect 10 also includes acircuit trace 24 positioned on a surface of theflexible circuit 12. Thecircuit trace 24 electrically connects the raisedinterconnection member 14 at theproximate end 16 of theflexible circuit 12 with the corresponding raisedinterconnection member 14 at thedistal end 18 of theflexible circuit 12. It should also be appreciated that, because the Z-axiselectrical interconnect 10 has aflexible circuit 12, theinterconnect 10 can be tailored to have custom mating locations and raisedinterconnection members 14 on multiple rows. - The Z-axis
electrical interconnect 10 is folded into a U-shape, with the raisedinterconnection member 14 facing outwardly. To maintain the shape, the Z-axiselectrical interconnect 10 includes aspring 26 fixedly positioned between the proximate anddistal ends flexible circuit 12. Thespring 26 is bonded to theflexible circuit 12, such as with an adhesive. Preferably, thespring 12 is elastomeric so as to maintain the shape of the Z-axiselectrical interconnect 10 while providing conformity and pressure to the raisedinterconnection members 14 when in contact with the first and secondelectrical devices electrical interconnect 10 requires a minimal insertion force to install and maintain contact between the stacked first and secondelectrical devices - In operation, the Z-axis
electrical interconnect 10 is fixedly retained between the stacked first and secondelectrical devices electrical interconnect 10 may be retained on theelectrical devices electrical interconnect 10 includes atab 28 extending from theflexible circuit 12, such as from a side. Preferably, twotabs 28 are used, although there could be as many as fourtabs 28. The Z-axiselectrical interconnect 10 is positioned such that the raisedinterconnection member 14 is aligned with a mating contact (not shown) on the firstelectrical device 20. Thetab 28 is aligned with acorresponding slit 30 in the firstelectrical device 20, inserted into theslit 30, and fixedly retained, such as by folding thetab 28 over. Thetab 28 may also be bonded by an adhesive 31 to the firstelectrical device 20 to secure the Z-axiselectrical interconnect 10 to the firstelectrical device 20. - Still another example of fixturing is illustrated in FIG. 2. In this example,
solder 32 is used to secure the raisedinterconnection members 14 onto the firstelectrical device 20. It should be appreciated that conventional pick and place machines can automate this activity in large volumes. - The Z-axis
electrical interconnect 10 is connected to the secondelectrical device 22 in a similar manner. - The present invention has been described in an illustrative manner. It is to be understood that the terminology which has been used is intended to be in the nature of words of description rather than of limitation.
- Many modifications and variations of the present invention are possible in light of the above teachings. Therefore, within the scope of the appended claims, the present invention may be practiced other than as specifically described.
Claims (17)
1. A Z-axis electrical interconnect comprising:
a flexible printed circuit folded into a U-shape;
a plurality of raised interconnection members arranged on the flexible printed circuit in a predetermined pattern;
a circuit trace interconnecting said raised interconnection members; and
a spring fixedly positioned on said flexible printed circuit to maintain the U-shape.
2. A Z-axis electrical interconnect as set forth in wherein said predetermined pattern is a plurality of rows of interconnection members positioned along said flexible printed circuit.
claim 1
3. A Z-axis electrical interconnect as set forth in wherein said spring is elastomeric.
claim 2
4. A Z-axis electrical interconnect as set forth in wherein said spring is adhesively bonded to said flexible printed circuit.
claim 3
5. A Z-axis electrical interconnect as set forth in including a tab extending from an edge of said flexible printed circuit for fixedly retaining the Z-axis electrical interconnect to a device.
claim 4
6. A Z-axis electrical interconnect as set forth in including an adhesive to bond said tab to the device.
claim 5
7. A Z-axis electrical interconnect as set forth in wherein said interconnection members are soldered to a device.
claim 1
8. A Z-axis electrical interconnect for electrically connecting two stacked electrical devices comprising:
a flexible printed circuit folded into a U-shape;
a first row of interconnection members positioned along a distal end of said flexible printed circuit and a second row of interconnection members positioned along a proximate end of said flexible printed circuit;
a circuit trace connecting at least one of said raised interconnection members from said distal end of said flexible printed circuit board with a corresponding one of said raised interconnection members from said proximate end of said flexible printed circuit; and
a spring fixedly positioned between said distal end of said flexible printed circuit and said proximate end of said flexible printed circuit to maintain the U-shape.
9. A Z-axis electrical interconnect as set forth in including a tab extending from an edge of said flexible printed circuit for fixedly retaining the Z-axis electrical interconnect to the electrical device.
claim 8
10. A Z-axis electrical interconnect as set forth in wherein said spring is elastomeric.
claim 8
11. A Z-axis electrical interconnect as set forth in wherein said spring is adhesively bonded to said flexible printed circuit.
claim 8
12. A Z-axis electrical interconnect as set forth in including solder to secure said interconnection members to the electrical device.
claim 8
13. A Z-axis electrical interconnect as set forth in including an adhesive to bond said tab to the electrical device.
claim 9
14. A Z-axis electrical interconnect for electrically connecting two stacked electrical devices comprising:
a flexible printed circuit folded into a U-shape;
a first row of interconnection members positioned along a distal end of said flexible printed circuit and a second row of interconnection members positioned along a proximate end of said flexible printed circuit;
a circuit trace connecting one of said raised interconnection members from said distal end of said flexible printed circuit with a corresponding one of said raised interconnection members from said proximate end of said flexible printed circuit;
an elastomeric spring fixedly positioned between said distal end of said flexible printed circuit and said proximate end of said flexible printed circuit to maintain the U-shape; and
a tab extending from an edge of said flexible printed circuit for fixedly retaining the Z-axis electrical interconnect to the devices.
15. A Z-axis electrical interconnect as set forth in wherein said spring is adhesively bonded to said flexible printed circuit.
claim 14
16. A Z-axis electrical interconnect as set forth in including an adhesive to bond said tab to the devices.
claim 14
17. A Z-axis electrical interconnect as set forth in including solder to secure said raised interconnection members to the devices.
claim 14
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US09/277,894 US6358064B2 (en) | 1999-03-29 | 1999-03-29 | Z-axis electrical interconnect |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US09/277,894 US6358064B2 (en) | 1999-03-29 | 1999-03-29 | Z-axis electrical interconnect |
Publications (2)
Publication Number | Publication Date |
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US20010041465A1 true US20010041465A1 (en) | 2001-11-15 |
US6358064B2 US6358064B2 (en) | 2002-03-19 |
Family
ID=23062829
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Application Number | Title | Priority Date | Filing Date |
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US09/277,894 Expired - Fee Related US6358064B2 (en) | 1999-03-29 | 1999-03-29 | Z-axis electrical interconnect |
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US (1) | US6358064B2 (en) |
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