US2503261A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control system for heaters
Assignee: Individual
•
Filing: 1947-03-20
•
Granted: 1950-04-11
•
Expires: 1967-03-20
Abstract
No abstract record available.
Inventors
- 👤 William D Hall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:19
CPC Classifications
F; F23; F23N; F23N3/00; F23N3/08; F23N3/082; B; B60; B60H; B60H1/00; B60H1/22; B60H1/2203; F23N5/00; F23N5/02; F23N5/04; F23N5/042; F23N2225/00; F23N2225/08; F23N2233/00; F23N2233/06; F23N2233/08; F23N2241/00; F23N2241/02; F23N2241/14
Claims Analysis
Total Claims: 0
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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 |