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US2553820A
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Assignee: Fram Corp
•
Filing: 1948-04-23
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Granted: 1951-05-22
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Expires: 1968-04-23
Abstract
No abstract record available.
Inventors
- 👤 Earl G Gunn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:15
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11; B01D29/13; B01D29/15; B01D2201/00; B01D2201/18; B01D2201/182
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1061928A
Cited
US1726035A
Cited
US1694939A
Cited
US1872430A
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US2359475A
Cited
US2436108A
Cited
US2501582A
Cited
US2472012A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-21 | 1954-11-20 | 1955-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-21 | 1958-11-20 | 1959-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-21 | 1962-11-20 | 1963-05-22 | $7700.00 | Window Closed / Lapsed |