US3582415A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of etching cu with use of pb and sn layers as a mask
Assignee: Shipley Co Inc
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Filing: 1969-01-09
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Granted: 1971-06-01
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Expires: 1989-01-09
Abstract
Abstract A PROCESS FOR PLATING A CUPREOUS SURFACE COMPRISING FIRST PLATING SAID SURFACE WITH IMMERSION LEAD AND THEREAFTER PLATING WITH IMMERSION TIN. THE PROCESS IS PARTICULARLY APPLICABLE TO THE FORMATION OF PRINTED CIRCUIT BOARDS WHERE THE STEPS WOULD COMPRISE APPLYING A NEGATIVE PLATING RESIST IN AN IMAGE PATTERN OVER AN INSULATING SUBSTRATE HAVING A SURFACE OF CUPREOUS METAL, THE EXPOSED AREA OF SAID METAL NOT COVERED BY THE RESIST DEFINING A DESIRED CONDUCTOR PATTERN, PROVIDING A LEAD COATING OVER THE EXPOSED METAL BY IMMERSION PLATING, PROVIDING AN IMMERSION PLATING OF TIN OVER THE LEAD, REMOVING THE PLATING RESIST AND ETCHING METAL EXPOSED BE REMOVAL OF THE PLATING RESIST.
Inventors
- 👤 Michael Gulla
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:21
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/16; C23C18/31; C23C18/1601; C23C18/1603; C23C18/1605; C23C18/54; C23F; C23F1/00; C23F1/02; H; H05; H05K; H05K3/00; H05K3/02; H05K3/06; H05K3/061; H05K3/062; H05K2201/00; H05K2201/03; H05K2201/0332; H05K2201/0335; H05K2201/0338; H05K2203/00; H05K2203/07; H05K2203/0703; H05K2203/072; H05K3/30; H05K3/32; H05K3/34; H05K3/3465; H05K3/3473
Claims Analysis
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References Cited (Backward Citations)
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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) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |