US3616283A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making electrical contact pins
Assignee: International Business Machines Corp
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Filing: 1969-09-29
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Granted: 1971-10-26
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Expires: 1989-09-29
Abstract
Abstract Selectively gold-plated electrical contact pins are mounted in multiple layer printed circuit boards. The gold plating at regions to be soldered to the board is thinner than at contact regions to prevent excessive tin-gold union and resultant solder joint contamination. Also, a process of fabricating the pins including applying a resinous based substance thereon and forming a plating resistive mask at preselected regions, electroplating gold thereon, and thereafter removing the mask and replating.
Inventors
- 👤 Robert A Magee
- 👤 Joseph S Scioscia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:56
CPC Classifications
C; C25; C25D; C25D5/00; C25D5/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
The method of claim 1 wherein the step of carrying electrical contact pins in a rotating transfer wheel comprises the step of carrying electrical contact pins in peripheral slots of a rotating transfer wheel, and wherein the step of transferring the pins from the rotating transfer wheel to an oven comprises transferring the pins from said peripheral slots into retaining slots of a conveyor that receives the pins directly from the transfer wheel, which conveyor carries the pins to said oven.
Claim 2
Dependent Claim
54 words
The method of claim 1 wherein the step of causing another rotating wheel carrying a liquid substance to contact each pin and to cause relative rotation therebetween comprises causing the another rotating wheel to contact the center region of each pin wherein the liquid substance is applied to the center region of the pins.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |