Patent US2165931A successfully refreshed from Google Patents.
US2165931A
Expired / Lapsed
US
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Hollow disk filter aid retaining medium
Assignee: LE VAL FILTER Co Inc
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Filing: 1938-01-31
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Granted: 1939-07-11
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Expires: 1958-01-31
Abstract
No abstract record available.
Inventors
- 👤 Jerome B Levy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:10
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/39; B01D29/41; B01D37/00; B01D37/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1942-07-10 | 1943-01-09 | 1943-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-07-10 | 1947-01-09 | 1947-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-07-10 | 1951-01-09 | 1951-07-11 | $7700.00 | Window Closed / Lapsed |