US2509690A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tank heater
Assignee: Individual
•
Filing: 1946-08-07
•
Granted: 1950-05-30
•
Expires: 1966-08-07
Abstract
No abstract record available.
Inventors
- 👤 Eunice M Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:26
CPC Classifications
A; A47; A47J; A47J36/00; A47J36/24; F; F24; F24H; F24H1/00; F24H1/0054
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US512191A
Cited
US614034A
Cited
US723538A
Cited
US1048795A
Cited
US1227566A
Cited
US1485668A
Cited
US2240283A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-05-29 | 1953-11-28 | 1954-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-29 | 1957-11-28 | 1958-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-29 | 1961-11-28 | 1962-05-30 | $7700.00 | Window Closed / Lapsed |