US2710181A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas heater control
Assignee: Individual
•
Filing: 1951-02-28
•
Granted: 1955-06-07
•
Expires: 1971-02-28
Abstract
No abstract record available.
Inventors
- 👤 William S Parrett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:17
CPC Classifications
F; F23; F23N; F23N5/00; F23N5/02; F23N5/10; F23N5/105; F23N2227/00; F23N2227/22; F23N2227/26; F23N2229/00; F23N2229/16; F23N2233/00; F23N2233/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1361263A
Cited
US1981479A
Cited
US1888730A
Cited
US2021647A
Cited
US2375569A
Cited
US2371020A
Cited
US2384696A
Cited
US2471343A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-06-06 | 1958-12-06 | 1959-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-06-06 | 1962-12-06 | 1963-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-06-06 | 1966-12-06 | 1967-06-07 | $7700.00 | Window Closed / Lapsed |