Patent US2503262A successfully refreshed from Google Patents.
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 11:10
CPC Classifications
F; F24; F24H; F24H9/00; F24H9/20; F24H9/2064
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2172667A
Cited
US1233518A
Cited
US1684599A
Cited
US1749499A
Cited
US1919743A
Cited
US2243609A
Cited
US2295841A
Cited
US2308507A
Cited
US2437287A
Cited
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 |