US3565707A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal dissolution
Assignee: FMC Corp
•
Filing: 1969-03-03
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Granted: 1971-02-23
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Expires: 1989-03-03
Abstract
Abstract PROCESS FOR DISSOLVING CERTAIN METALS, NAMELY NICKEL, TIN, AND ALLOYS THEREOF, WHICH ARE NOT ETCHED BY PERSULFATE SOLUTIONS ALONE, BY TREATING THEM IN AN ETCHANT CONTAINING 8 TO 45% BY WEIGHT OF A PERSULFATE AND 0.2 ATO 40% OF AN ACID WHICH MAY BE EITHER FLUOSILICIC, FLUOBORIC OR HYDROFLUORIC ACID.
Inventors
- 👤 Kenneth John Radimer
- 👤 Frank Edward Caropreso
- 👤 Bernard James Hogya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 00:31
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/10; C23F1/14; C23F1/16; C23F1/30; C23F1/02; C23F1/18; C23F1/28; H; H05; H05K; H05K3/00; H05K3/02; H05K3/06; H05K3/067
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) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |