US2556521A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter element
Assignee: Fram Corp
•
Filing: 1946-11-14
•
Granted: 1951-06-12
•
Expires: 1966-11-14
Abstract
No abstract record available.
Inventors
- 👤 Charles B Chase
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:08
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11; B01D29/13; B01D29/15; B01D29/21; B01D29/213; B01D29/88; B01D29/92; B01D29/925
Claims Analysis
Total Claims: 0
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US2164966A
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US2239868A
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US2364617A
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US2355714A
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US2372865A
Cited
US2468866A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-06-11 | 1954-12-11 | 1955-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-11 | 1958-12-11 | 1959-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-11 | 1962-12-11 | 1963-06-12 | $7700.00 | Window Closed / Lapsed |