US2568181A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Quickly removable filter casing cover
Assignee: Fram Corp
•
Filing: 1947-11-28
•
Granted: 1951-09-18
•
Expires: 1967-11-28
Abstract
No abstract record available.
Inventors
- 👤 Robert M Zimmerman
- 👤 Walter V Kennedy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:26
CPC Classifications
B; B01; B01D; B01D27/00; B01D27/02; B01D27/08; B01D2201/00; B01D2201/40; B01D2201/4015
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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FR574540A
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FR696574A
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US2128589A
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US2145535A
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US2311320A
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US2354481A
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US2389814A
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US2420315A
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US2431782A
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US2441344A
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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) | 1954-09-17 | 1955-03-19 | 1955-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-09-17 | 1959-03-19 | 1959-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-09-17 | 1963-03-19 | 1963-09-18 | $7700.00 | Window Closed / Lapsed |