Patent US2811218A successfully refreshed from Google Patents.
US2811218A
Expired / Lapsed
US
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Oil filter and air separator
Assignee: Individual
•
Filing: 1954-10-18
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Granted: 1957-10-29
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Expires: 1974-10-18
Abstract
No abstract record available.
Inventors
- 👤 Charles A Winslow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:14
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/14; B01D19/00; B01D19/0042; B01D19/0052; B01D19/0057; B01D29/00; B01D29/11; B01D29/13; B01D29/15; B01D29/50; B01D29/52; B01D29/88; B01D29/90; B01D29/908; B01D35/147; F; F22; F22B; F22B37/00; F22B37/02; F22B37/26; F22B37/265
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US169362A
Cited
US1176732A
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US2010435A
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US2252687A
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US2390841A
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US2443875A
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US2420115A
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US2483448A
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US2507125A
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US2707562A
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US2705053A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-28 | 1961-04-29 | 1961-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-28 | 1965-04-29 | 1965-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-28 | 1969-04-29 | 1969-10-29 | $7700.00 | Window Closed / Lapsed |