Patent US3399090A successfully refreshed from Google Patents.
US3399090A
Expired / Lapsed
US
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Process of etching metal with ammonium persulfate with recovery and recycling
Assignee: FMC Corp
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Filing: 1967-09-26
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Granted: 1968-08-27
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Expires: 1987-09-26
Abstract
No abstract record available.
Inventors
- 👤 Frank E Caropreso
- 👤 Kenneth J Radimer
- 👤 Bernard J Hogya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:16
CPC Classifications
C; C25; C25C; C25C7/00; C25C7/02; C01; C01B; C01B15/00; C01B15/055; C01B15/06; C01B15/08; C01C; C01C1/00; C01C1/24; C01G; C01G3/00; C01G3/10; C23; C23F; C23F1/00; C23F1/46; C25C1/00; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-08-27 | 1972-02-26 | 1972-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-27 | 1976-02-26 | 1976-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-27 | 1980-02-26 | 1980-08-27 | $7700.00 | Window Closed / Lapsed |