Patent US2539378A successfully refreshed from Google Patents.
US2539378A
Expired / Lapsed
US
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Crankcase breather opening filter
Assignee: Fram Corp
•
Filing: 1948-02-07
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Granted: 1951-01-23
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Expires: 1968-02-07
Abstract
No abstract record available.
Inventors
- 👤 John H Stootman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:50
CPC Classifications
F; F01; F01M; F01M13/00; F01M13/0033
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US139131A
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US310157A
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US1792824A
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US2073156A
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US2154072A
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GB199297A
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US1464741A
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US1561928A
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US2243866A
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US2187264A
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US2187265A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-22 | 1954-07-24 | 1955-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-22 | 1958-07-24 | 1959-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-22 | 1962-07-24 | 1963-01-23 | $7700.00 | Window Closed / Lapsed |