Patent US2897971A successfully refreshed from Google Patents.
US2897971A
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US
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Filtering cartridge for liquids and gases
Assignee: Individual
•
Filing: 1954-11-12
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Granted: 1959-08-04
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Expires: 1974-11-12
Abstract
No abstract record available.
Inventors
- 👤 Gewiss Lucien Victor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:27
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/52; B01D46/521; B01D46/522; B01D29/00; B01D29/11; B01D29/111; B01D29/13; B01D29/15; B01D29/21; B01D46/24; B01D46/2403; B01D46/2411; B01D2201/00; B01D2201/12; Y; Y10; Y10S; Y10S493/00; Y10S493/941
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR16250E
Cited
FR437614A
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FR729531A
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US2278603A
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US2395449A
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US2421704A
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US2456292A
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US2488726A
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US2556521A
Cited
US2683537A
Cited
US2675127A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-03 | 1963-02-02 | 1963-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-03 | 1967-02-02 | 1967-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-03 | 1971-02-02 | 1971-08-04 | $7700.00 | Window Closed / Lapsed |