US3537845A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation and recovery of cobalt and zinc
Assignee: Dow Chemical Co
•
Filing: 1967-04-24
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Granted: 1970-11-03
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Expires: 1987-04-24
Abstract
No abstract record available.
Inventors
- 👤 Alfred W Oberhofer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:02
CPC Classifications
C; C01; C01G; C01G9/00; C01G9/003; C01G51/00; C01G51/01; C22; C22B; C22B3/00; C22B3/20; C22B3/42; Y; Y02; Y02P; Y02P10/00; Y02P10/20
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) | 1973-11-02 | 1974-05-04 | 1974-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-02 | 1978-05-04 | 1978-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-02 | 1982-05-04 | 1982-11-03 | $7700.00 | Window Closed / Lapsed |