US2276144A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fan heater unit
Assignee: BF Sturtevant Co
•
Filing: 1940-08-17
•
Granted: 1942-03-10
•
Expires: 1960-08-17
Abstract
No abstract record available.
Inventors
- 👤 Carl O Bergstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:02
CPC Classifications
F; F24; F24H; F24H3/00; F24H3/02; F24H3/04; F24H3/0405; F24H3/0411; F24H3/0417
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) | 1945-03-09 | 1945-09-08 | 1946-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-03-09 | 1949-09-08 | 1950-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-03-09 | 1953-09-08 | 1954-03-10 | $7700.00 | Window Closed / Lapsed |