Patent US1746294A successfully refreshed from Google Patents.
US1746294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous calcination of gypsum
Assignee: Individual
•
Filing: 1926-06-02
•
Granted: 1930-02-11
•
Expires: 1946-06-02
Abstract
No abstract record available.
Inventors
- 👤 Alva W Tyler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:56
CPC Classifications
C; C04; C04B; C04B11/00; C04B11/02; C04B11/028; C04B11/032
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) | 1933-02-10 | 1933-08-12 | 1934-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1937-02-10 | 1937-08-12 | 1938-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1941-02-10 | 1941-08-12 | 1942-02-11 | $7700.00 | Window Closed / Lapsed |