Patent US3050601A successfully refreshed from Google Patents.
Patent US2969787A successfully refreshed from Google Patents.
US2969787A
Expired / Lapsed
US
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Air-heater and safety feature for same
Assignee: Individual
•
Filing: 1959-07-27
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Granted: 1961-01-31
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Expires: 1979-07-27
Abstract
No abstract record available.
Inventors
- 👤 Raymond R Dupler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:09
CPC Classifications
F; F24; F24C; F24C3/00; F24C3/12; F24C3/122; F24B; F24B1/00; F24B1/18; F24B1/1808; F24H; F24H3/00; F24H3/006
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US535100A
Cited
US2089653A
Cited
US2188339A
Cited
US2538492A
Cited
US2604313A
Cited
US2747568A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-01-31 | 1964-08-01 | 1965-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-31 | 1968-08-01 | 1969-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-31 | 1972-08-01 | 1973-01-31 | $7700.00 | Window Closed / Lapsed |