US1961425A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of reducing zinc ores
Assignee: HENRY A DOERNER
•
Filing: 1932-07-07
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Granted: 1934-06-05
•
Expires: 1952-07-07
Abstract
No abstract record available.
Inventors
- 👤 Charles G Maier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:57
CPC Classifications
C; C22; C22B; C22B19/00; C22B19/04; C22B19/14
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) | 1937-06-04 | 1937-12-04 | 1938-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-06-04 | 1941-12-04 | 1942-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-06-04 | 1945-12-04 | 1946-06-05 | $7700.00 | Window Closed / Lapsed |