US2581942A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel burning air heater
Assignee: Stewart Warner Corp
•
Filing: 1946-07-17
•
Granted: 1952-01-08
•
Expires: 1966-07-17
Abstract
No abstract record available.
Inventors
- 👤 Arthur R Collins
- 👤 Frank A Ryder
- 👤 Ross D Randall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:05
CPC Classifications
F; F24; F24H; 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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US2329473A
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US2289759A
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US2307356A
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US2386115A
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US2401330A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-01-07 | 1955-07-09 | 1956-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-01-07 | 1959-07-09 | 1960-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-01-07 | 1963-07-09 | 1964-01-08 | $7700.00 | Window Closed / Lapsed |