Patent US2758591A successfully refreshed from Google Patents.
US2758591A
Expired / Lapsed
US
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Air heating furnace and control system therefor
Assignee: American Air Filter Co Inc
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Filing: 1952-03-14
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Granted: 1956-08-14
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Expires: 1972-03-14
Abstract
No abstract record available.
Inventors
- 👤 Arthur F Hubbard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:25
CPC Classifications
F; F24; F24H; F24H9/00; F24H9/20; F24H9/2064; F24H9/2085; F24H3/00; F24H3/02; F24H3/06; F24H3/065
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1834398A
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US1958814A
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US2070427A
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US2418566A
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US2416935A
Cited
US2451760A
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US2429101A
Cited
US2386807A
Cited
US2560118A
Cited
US2604149A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-08-14 | 1960-02-13 | 1960-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-08-14 | 1964-02-13 | 1964-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-08-14 | 1968-02-13 | 1968-08-14 | $7700.00 | Window Closed / Lapsed |