US2508889A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Floor furnace with removable heater unit
Assignee: Individual
•
Filing: 1946-12-11
•
Granted: 1950-05-23
•
Expires: 1966-12-11
Abstract
No abstract record available.
Inventors
- 👤 Carl B Richardson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:10
CPC Classifications
F; F24; F24H; F24H3/00; F24H3/006
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1885891A
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USRE22332E
Cited
US1405187A
Cited
US1666367A
Cited
US1697687A
Cited
US1754096A
Cited
US1841569A
Cited
US2272423A
Cited
US2144129A
Cited
US2378485A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-05-22 | 1953-11-21 | 1954-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-22 | 1957-11-21 | 1958-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-22 | 1961-11-21 | 1962-05-23 | $7700.00 | Window Closed / Lapsed |