US2491831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coke oven doors
Assignee: ALOIS W GRAF
•
Filing: 1946-05-08
•
Granted: 1949-12-20
•
Expires: 1966-05-08
Abstract
No abstract record available.
Inventors
- 👤 Krieger Sidney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:12
CPC Classifications
C; C10; C10B; C10B25/00; C10B25/02; C10B25/06
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US573406A
Cited
US890175A
Cited
US925651A
Cited
US948936A
Cited
GB191106716A
Cited
US1143411A
Cited
US1269283A
Cited
US1399594A
Cited
US1561544A
Cited
US1744798A
Cited
FR682689A
Cited
US1921415A
Cited
US1897693A
Cited
US1873186A
Cited
US2186450A
Cited
US2219461A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-19 | 1953-06-20 | 1953-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-19 | 1957-06-20 | 1957-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-19 | 1961-06-20 | 1961-12-20 | $7700.00 | Window Closed / Lapsed |