US3020976A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air filter control unit
Assignee: American Air Filter Co Inc
•
Filing: 1957-12-31
•
Granted: 1962-02-13
•
Expires: 1977-12-31
Abstract
No abstract record available.
Inventors
- 👤 Philip L Hyatt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:24
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/28; B; B01; B01D; B01D46/00; B01D46/42; B01D46/44; B01D46/46; Y; Y10; Y10S; Y10S55/00; Y10S55/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1780380A
Cited
US2177083A
Cited
US2516680A
Cited
US2626012A
Cited
US2687173A
Cited
US2963112A
Cited
US2848064A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-02-12 | 1965-08-14 | 1966-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-12 | 1969-08-14 | 1970-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-12 | 1973-08-14 | 1974-02-13 | $7700.00 | Window Closed / Lapsed |