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US2850113A
Expired / Lapsed
US
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Air filter
Assignee: Beazer East Inc
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Filing: 1955-07-11
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Granted: 1958-09-02
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Expires: 1975-07-11
Abstract
No abstract record available.
Inventors
- 👤 Turner John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:44
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US394408A
Cited
US1862839A
Cited
US1949002A
Cited
US2244165A
Cited
US2709500A
Cited
US2752003A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-01 | 1962-03-03 | 1962-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-01 | 1966-03-03 | 1966-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-01 | 1970-03-03 | 1970-09-02 | $7700.00 | Window Closed / Lapsed |