US3481478A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil filter with paper filtering element
Assignee: CALVIN WHITED
•
Filing: 1967-01-30
•
Granted: 1969-12-02
•
Expires: 1987-01-30
Abstract
No abstract record available.
Inventors
- 👤 Zelmer Lee Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:12
CPC Classifications
B; B01; B01D; B01D27/00; B01D27/04; B01D27/06; B01D27/07
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US478157A
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US3184063A
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US3342339A
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US3346120A
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US3405805A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-12-01 | 1973-06-02 | 1973-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-01 | 1977-06-02 | 1977-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-01 | 1981-06-02 | 1981-12-02 | $7700.00 | Window Closed / Lapsed |