US2963112A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic air filter
Assignee: GREEN FUEL ECONOMIZER CO Inc
•
Filing: 1956-05-03
•
Granted: 1960-12-06
•
Expires: 1976-05-03
Abstract
No abstract record available.
Inventors
- 👤 William L Cawthon
- 👤 Omer A Petti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:49
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1387731A
Cited
US1783181A
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US2119978A
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FR985432A
Cited
US2626012A
Cited
GB700352A
Cited
US2722998A
Cited
US2763139A
Cited
US2807330A
Cited
GB746162A
Cited
US2853155A
Cited
US2850113A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-12-06 | 1964-06-06 | 1964-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-06 | 1968-06-06 | 1968-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-06 | 1972-06-06 | 1972-12-06 | $7700.00 | Window Closed / Lapsed |