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Patent US2935157A successfully refreshed from Google Patents.
US2935157A
Expired / Lapsed
US
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Support for air filter units and the like
Assignee: GEORGE EVANS Corp
•
Filing: 1958-07-18
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Granted: 1960-05-03
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Expires: 1978-07-18
Abstract
No abstract record available.
Inventors
- 👤 Harry V First
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:25
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/10; B01D46/12; F; F24; F24F; F24F13/00; F24F13/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA523897A
Cited
US2158717A
Cited
US2582219A
Cited
FR1065980A
Cited
US2793405A
Cited
US2792906A
Cited
GB797100A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-03 | 1963-11-02 | 1964-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-03 | 1967-11-02 | 1968-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-03 | 1971-11-02 | 1972-05-03 | $7700.00 | Window Closed / Lapsed |