Patent US2754972A successfully refreshed from Google Patents.
US2754972A
Expired / Lapsed
US
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Integral filter unit
Assignee: WARNER LEWIS Co
•
Filing: 1952-04-05
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Granted: 1956-07-17
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Expires: 1972-04-05
Abstract
No abstract record available.
Inventors
- 👤 Kelly F Mccann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:59
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11; B01D29/31; B01D29/33; B01D2201/00; B01D2201/04; B01D2201/043; B01D2201/0446
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB189805995A
Cited
US1218738A
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US2042564A
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US2316526A
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US2559614A
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US2584387A
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US2517753A
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US2525330A
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US2571059A
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US2537897A
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US2592104A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-07-17 | 1960-01-16 | 1960-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-17 | 1964-01-16 | 1964-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-17 | 1968-01-16 | 1968-07-17 | $7700.00 | Window Closed / Lapsed |