US2805140A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Briquette of synthetic chromium ore
Assignee: American Potash and Chemical Corp
•
Filing: 1951-03-09
•
Granted: 1957-09-03
•
Expires: 1971-03-09
Abstract
No abstract record available.
Inventors
- 👤 Joseph C Schumacher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:31
CPC Classifications
C; C22; C22B; C22B1/00; C22B1/14; C22B1/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1960-09-02 | 1961-03-04 | 1961-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-02 | 1965-03-04 | 1965-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-02 | 1969-03-04 | 1969-09-03 | $7700.00 | Window Closed / Lapsed |