US3025407A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable heater
Assignee: American Air Filter Co Inc
•
Filing: 1957-08-19
•
Granted: 1962-03-13
•
Expires: 1977-08-19
Abstract
No abstract record available.
Inventors
- 👤 Aubrey H Robson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:52
CPC Classifications
F; F28; F28F; F28F27/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1778036A
Cited
US1834958A
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US2273502A
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US2410353A
Cited
US2405145A
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US2355208A
Cited
US2396657A
Cited
GB678343A
Cited
US2630537A
Cited
US2799782A
Cited
US2789234A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-03-12 | 1965-09-11 | 1966-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-03-12 | 1969-09-11 | 1970-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-03-12 | 1973-09-11 | 1974-03-13 | $7700.00 | Window Closed / Lapsed |