Patent US1922490A successfully refreshed from Google Patents.
US1922490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of metals from ores
Assignee: DAVISON CHEMICAL Co
•
Filing: 1931-03-30
•
Granted: 1933-08-15
•
Expires: 1951-03-30
Abstract
No abstract record available.
Inventors
- 👤 Ernest B Miller
- 👤 Gerald C Connolly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:41
CPC Classifications
C; C22; C22B; C22B1/00; C22B1/02; C22B1/06
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1936-08-14 | 1937-02-13 | 1937-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-08-14 | 1941-02-13 | 1941-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-08-14 | 1945-02-13 | 1945-08-15 | $7700.00 | Window Closed / Lapsed |