Patent US3562039A successfully refreshed from Google Patents.
US3562039A
Expired / Lapsed
US
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Method of improving the solderability of conductor plates
Assignee: Siemens AG
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Filing: 1968-10-10
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Granted: 1971-02-09
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Expires: 1988-10-10
Abstract
Abstract THROUGH ETCHING, PREFERABLY WITH ETCHABLE CUPRIC IONS, THE SOLDERABILITY OF ELECTRICAL COPPER CONDUCTORS CAN BE CONSIDERABLY IMPROVED OR RESTORED.
Inventors
- 👤 Josef Strohmayer
- 👤 August Stumbaum
- 👤 Hans-Hermann Merkenschlager
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:53
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/10; C23F1/14; C23F1/16; C23F1/18
Claims Analysis
Total Claims: 0
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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) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |