US2780218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Unitary heating device for supplying hot combustion gases and hot air
Assignee: Stewart Warner Corp
•
Filing: 1952-09-11
•
Granted: 1957-02-05
•
Expires: 1972-09-11
Abstract
No abstract record available.
Inventors
- 👤 Arthur C Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:38
CPC Classifications
B; B44; B44D; B44D3/00; B44D3/16; B44D3/166; F; F24; F24H; F24H3/00; F24H3/02; F24H3/06; F24H3/08; F24H3/087; F28; F28D; F28D7/00; F28D7/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1329052A
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US1288506A
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US1519673A
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US1573406A
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US1781542A
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US2028095A
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US2156101A
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US2447902A
Cited
US2531139A
Cited
US2579507A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-02-05 | 1960-08-06 | 1961-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-02-05 | 1964-08-06 | 1965-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-02-05 | 1968-08-06 | 1969-02-05 | $7700.00 | Window Closed / Lapsed |