Patent US2979159A successfully refreshed from Google Patents.
US2979159A
Expired / Lapsed
US
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Air filters
Assignee: Fram Corp
•
Filing: 1958-12-02
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Granted: 1961-04-11
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Expires: 1978-12-02
Abstract
No abstract record available.
Inventors
- 👤 Hugh E Pritchard
- 👤 Gregory P Shaltz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:35
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/52; B01D46/521; B01D46/24; B01D46/2403; B01D46/2411; B01D46/30; F; F02; F02M; F02M35/00; F02M35/02; F02M35/024; B01D2265/00; B01D2265/02; B01D2265/027; B01D2265/028; B01D2265/04; B01D2265/05; B01D2265/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1943592A
Cited
US2170074A
Cited
GB622279A
Cited
FR989832A
Cited
GB660864A
Cited
US2597927A
Cited
GB711735A
Cited
US2795290A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-10 | 1964-10-10 | 1965-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-10 | 1968-10-10 | 1969-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-10 | 1972-10-10 | 1973-04-11 | $7700.00 | Window Closed / Lapsed |