US3446720A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of high-purity nickel and cobalt
Assignee: United States Department of the Interior
•
Filing: 1965-01-27
•
Granted: 1969-05-27
•
Expires: 1985-01-27
Abstract
No abstract record available.
Inventors
- 👤 Parkman T Brooks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:10
CPC Classifications
C; C22; C22B; C22B3/00; C22B3/20; C22B3/26; C22B3/28; C22B3/282; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1409727A
Cited
US2384300A
Cited
US2877250A
Cited
US2955932A
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US3128156A
Cited
US3197274A
Cited
US3304246A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-26 | 1972-11-25 | 1973-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-26 | 1976-11-25 | 1977-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-26 | 1980-11-25 | 1981-05-27 | $7700.00 | Window Closed / Lapsed |