US1976735A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of sulphide ores
Assignee: Individual
•
Filing: 1930-12-29
•
Granted: 1934-10-16
•
Expires: 1950-12-29
Abstract
No abstract record available.
Inventors
- 👤 Charles R Kuzell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:26
CPC Classifications
C; C22; C22B; C22B15/00; C22B15/0026; C22B15/0028; C22B15/0052; C22B15/0002; C22B15/001; C22B15/0013; C22B15/0015; C22B15/003; C22B15/0041; C22B15/0043
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) | 1937-10-15 | 1938-04-16 | 1938-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-10-15 | 1942-04-16 | 1942-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-10-15 | 1946-04-16 | 1946-10-16 | $7700.00 | Window Closed / Lapsed |