US4747783A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resistive pin for printed circuit card connector
Assignee: International Business Machines Corp
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Filing: 1986-10-28
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Granted: 1988-05-31
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Expires: 2006-10-28
Abstract
Abstract An improved connector assembly includes a resistor coated guide pin to facilitate coupling or decoupling a circuit card to a circuit board. A first embodiment of the pin configuration comprises a single taper pin for eliminating current surges during insertion of the pin into its associated plug. A second embodiment of the pin configuration comprises a dual taper pin having two zones of resistance for also eliminating the spark and associated high frequency noise resulting from pin insertion into or removal from the connector assembly.
Inventors
- 👤 Paul D. Bellamy
- 👤 Richard A. Fritz
- 👤 Wayne V. Myers
- 👤 Gary J. Robinson
- 👤 Raymond L. Simonetty
- 👤 Jordan M. Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:01
CPC Classifications
H; H01; H01R; H01R13/00; H01R13/02; H01R13/03; H01R12/00; H01R12/70; H01R12/71; H01R12/712; H01R13/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
162 words
A connector system for connecting or disconnecting a connector plug assembly while maintaining continuous operation of load devices associated with said connector system comprising, in combination, a socket, a plug having pins associated with the voltage and/or ground connections of a said load device and adapted for insertion or withdrawal into or from said socket, said pins of said plug being metallic and at least one of said pins having a resistive coating covering a portion thereof, the low resistance of said resistive coating preventing surge currents resulting from insertion or removal of said plug into or from said socket during operation of said system, whereby, upon plug insertion, said socket initially engages the resistive coating of said plug permitting limited current flow through said resistive coating to gradually charge components of the system and upon full insertion of said plug said socket extends past said resistive coating to engage a zone of said plug having a lower or nominal zero resistance.
Claim 2
Dependent Claim
162 words
A connector system for connecting or disconnecting a connector plug assembly while maintaining continuous operation of load devices associated with said connector system comprising, in combination, a socket, a plug having pins associated with the voltage and/or ground connections of a said load device and adapted for insertion or withdrawal into or from said socket, said pins of said plug being metallic and at least one of said pins having a resistive coating covering a portion thereof, the low resistance of said resistive coating preventing surge currents resulting from insertion or removal of said plug into or from said socket during operation of said system, whereby, upon plug insertion, said socket initially engages the resistive coating of said plug permitting limited current flow through said resistive coating to gradually charge components of the system and upon full insertion of said plug said socket extends past said resistive coating to engage a zone of said plug having a lower or nominal zero resistance.
Claim 3
Dependent Claim
31 words
A device of the character claimed in claim 1 wherein said connector plug comprises a circuit board and said socket comprises a circuit card adapted for connection to said circuit board.
Claim 4
Dependent Claim
20 words
A device of the character claimed in claim 2 wherein said resistive coated pins are associated with said circuit board.
Claim 5
Dependent Claim
25 words
A device of the character claimed in claim 2 wherein the connector socket associated with said resistive coated pin is located on said circuit card.
Claim 6
Dependent Claim
29 words
A device of the character claimed in claim 1 wherein the resistive coating of said pins comprises a multi-tapered configuration including a plurality of zones of different resistance values.
Claim 7
Dependent Claim
18 words
A device of the character claimed in claim 5 wherein said multi-tapered configuration is a two-zone resistance configuration.
Claim 8
Dependent Claim
39 words
A device of the character claimed in claim 6, wherein the higher of said two resistance zones is located at the point of said pin and adapted to eliminate arcing during insertion in of removal from its associated socket.
Claim 9
Dependent Claim
25 words
A device of the character claimed in claim 7, wherein the resistance of said contact upon full insertion of said pin is a nominal zero.
References Cited (Backward Citations)
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US3277424A
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US4002396A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-05-31 | 1991-11-30 | 1992-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-31 | 1995-11-30 | 1996-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-31 | 1999-11-30 | 2000-05-31 | $7700.00 | Window Closed / Lapsed |