US3380593A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Twist-on, axial flow filter element
Assignee: Walker Manufacturing Co
•
Filing: 1965-12-06
•
Granted: 1968-04-30
•
Expires: 1985-12-06
Abstract
No abstract record available.
Inventors
- 👤 James R Uhen
- 👤 Bruce E Reber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:41
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11; B01D27/00; B01D27/02; B01D27/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2563548A
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US2732075A
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US2110124A
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US2179784A
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US2203668A
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US2858026A
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US2979208A
Cited
US2995249A
Cited
US3272192A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-04-30 | 1971-10-30 | 1972-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-30 | 1975-10-30 | 1976-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-30 | 1979-10-30 | 1980-04-30 | $7700.00 | Window Closed / Lapsed |