US3470044A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrolytic regeneration of spent ammonium persulfate etchants
Assignee: FMC Corp
•
Filing: 1967-06-30
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Granted: 1969-09-30
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Expires: 1987-06-30
Abstract
No abstract record available.
Inventors
- 👤 Kenneth J Radimer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:38
CPC Classifications
C; C25; C25C; C25C7/00; C25C7/02; B; B01; B01D; B01D9/00; B01D9/0004; 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)
US2810686A
Cited
US3218254A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-09-29 | 1973-03-31 | 1973-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-29 | 1977-03-31 | 1977-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-29 | 1981-03-31 | 1981-09-30 | $7700.00 | Window Closed / Lapsed |