US2121887A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of sulphating an ore material
Assignee: HUGHES MITCHELL PROCESSES Inc
•
Filing: 1935-12-09
•
Granted: 1938-06-28
•
Expires: 1955-12-09
Abstract
No abstract record available.
Inventors
- 👤 Royal L Sessions
- 👤 Donald C Mitchell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:40
CPC Classifications
C; C22; C22B; C22B19/00; C22B19/02; C22B13/00; C22B15/00; C22B15/0002; C22B15/001; C22B15/0013; C22B15/0015; C22B15/0017; C22B15/0063; C22B15/0065; C22B15/0067; C22B15/0071; C22B19/20; C22B19/22; 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) | 1941-06-27 | 1941-12-27 | 1942-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1945-06-27 | 1945-12-27 | 1946-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1949-06-27 | 1949-12-27 | 1950-06-28 | $7700.00 | Window Closed / Lapsed |