Patent US2754746A successfully refreshed from Google Patents.
US2754746A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Doorway heater
Assignee: American Radiator and Standard Sanitary Corp
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Filing: 1952-10-16
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Granted: 1956-07-17
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Expires: 1972-10-16
Abstract
No abstract record available.
Inventors
- 👤 Gilbert G O'brien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:09
CPC Classifications
F; F24; F24F; F24F9/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US378266A
Cited
US774730A
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US1035678A
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US1279993A
Cited
US1230282A
Cited
US1506904A
Cited
GB212152A
Cited
US2150252A
Cited
US2516432A
Cited
US2558997A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-07-17 | 1960-01-16 | 1960-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-17 | 1964-01-16 | 1964-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-17 | 1968-01-16 | 1968-07-17 | $7700.00 | Window Closed / Lapsed |