US2503262A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermostatic air circulation fan control for combustion heaters
Assignee: Individual
•
Filing: 1947-12-12
•
Granted: 1950-04-11
•
Expires: 1967-12-12
Abstract
No abstract record available.
Inventors
- 👤 William D Hall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:15
CPC Classifications
F; F24; F24H; F24H9/00; F24H9/20; F24H9/2064
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2172667A
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US1233518A
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US1684599A
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US1749499A
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US1919743A
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US2243609A
Cited
US2295841A
Cited
US2308507A
Cited
US2437287A
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US2381567A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-04-10 | 1953-10-10 | 1954-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-10 | 1957-10-10 | 1958-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-10 | 1961-10-10 | 1962-04-11 | $7700.00 | Window Closed / Lapsed |