Patent US2809248A successfully refreshed from Google Patents.
US2809248A
Expired / Lapsed
US
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Oil filter signalling means
Assignee: ERNEST A TAPP
•
Filing: 1954-03-04
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Granted: 1957-10-08
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Expires: 1974-03-04
Abstract
No abstract record available.
Inventors
- 👤 Hershal S Frakes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:11
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/14; B01D35/143; B01D35/147; Y; Y10; Y10S; Y10S200/00; Y10S200/22; Y10S200/29
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1309362A
Cited
US808929A
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US1340668A
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GB157550A
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US1611219A
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FR581478A
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CH115010A
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US2348651A
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US2499494A
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US2497375A
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GB649640A
Cited
US2638581A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-07 | 1961-04-08 | 1961-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-07 | 1965-04-08 | 1965-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-07 | 1969-04-08 | 1969-10-08 | $7700.00 | Window Closed / Lapsed |