US2433498A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of roasting copperas
Assignee: Individual
•
Filing: 1942-12-10
•
Granted: 1947-12-30
•
Expires: 1962-12-10
Abstract
No abstract record available.
Inventors
- 👤 Alfred W Whitford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:53
CPC Classifications
C; C22; C22B; C22B1/00; C22B1/02; C01; C01G; C01G49/00; C01G49/02; C01G49/06; C22B1/14
Claims Analysis
Total Claims: 0
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US2287094A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-12-29 | 1951-06-30 | 1951-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-12-29 | 1955-06-30 | 1955-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-12-29 | 1959-06-30 | 1959-12-30 | $7700.00 | Window Closed / Lapsed |