US1494735A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Winning ammonium gas
Assignee: Individual
•
Filing: 1922-01-18
•
Granted: 1924-05-20
•
Expires: 1942-01-18
Abstract
No abstract record available.
Inventors
- 👤 Cooper Augustus Steiger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:13
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/16; E21B43/24; C; C01; C01C; C01C1/00; C01C1/02; C01C1/08
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) | 1927-05-20 | 1927-11-19 | 1928-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1931-05-20 | 1931-11-19 | 1932-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1935-05-20 | 1935-11-19 | 1936-05-20 | $7700.00 | Window Closed / Lapsed |