US2512439A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Furnace door
Assignee: GENEVA STEEL Co
•
Filing: 1948-06-08
•
Granted: 1950-06-20
•
Expires: 1968-06-08
Abstract
No abstract record available.
Inventors
- 👤 Edwin R Richards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:22
CPC Classifications
F; F23; F23M; F23M7/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US983494A
Cited
US1123874A
Cited
US1738283A
Cited
US1690606A
Cited
GB381619A
Cited
US2187669A
Cited
US2158759A
Cited
US2239896A
Cited
US2426568A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-06-19 | 1953-12-19 | 1954-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-06-19 | 1957-12-19 | 1958-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-06-19 | 1961-12-19 | 1962-06-20 | $7700.00 | Window Closed / Lapsed |