Patent US2935261A successfully refreshed from Google Patents.
US2935261A
Expired / Lapsed
US
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Damper operated switches for automatic heat control of gas fired unit ventilator
Assignee: American Air Filter Co Inc
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Filing: 1956-09-12
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Granted: 1960-05-03
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Expires: 1976-09-12
Abstract
No abstract record available.
Inventors
- 👤 Herbert G Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:44
CPC Classifications
F; F24; F24H; F24H9/00; F24H9/20; F24H9/2064; F24H9/2085; F24D; F24D19/00; F24D19/10; F24D19/1084; F24H15/00; F24H15/30; F24H15/305; F24H15/31; F24H15/33
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1288516A
Cited
US1811378A
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US1982717A
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US2126384A
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US2235150A
Cited
US2700505A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-03 | 1963-11-02 | 1964-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-03 | 1967-11-02 | 1968-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-03 | 1971-11-02 | 1972-05-03 | $7700.00 | Window Closed / Lapsed |