Patent US2697524A successfully refreshed from Google Patents.
US2697524A
Expired / Lapsed
US
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Liquid filter cartridge
Assignee: Individual
•
Filing: 1950-06-22
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Granted: 1954-12-21
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Expires: 1970-06-22
Abstract
No abstract record available.
Inventors
- 👤 William A Foust
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:22
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/39; B01D29/41
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1944550A
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US2103572A
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US2304618A
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US2359475A
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US2392354A
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US2455486A
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US2444147A
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US2473979A
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US2495095A
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US2548584A
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US2553820A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-12-20 | 1958-06-21 | 1958-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-12-20 | 1962-06-21 | 1962-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-12-20 | 1966-06-21 | 1966-12-21 | $7700.00 | Window Closed / Lapsed |