US2848064A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air and gas filter having automatically controlled movement of filter curtain
Assignee: CONTINENTAL FILTER Corp A CORP OF OHIO
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Filing: 1957-03-29
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Granted: 1958-08-19
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Expires: 1977-03-29
Abstract
No abstract record available.
Inventors
- 👤 William K Gregory
- 👤 John F Babbitt
- 👤 Langston P Bryant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:59
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/18; Y; Y10; Y10S; Y10S55/00; Y10S55/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-08-18 | 1962-02-17 | 1962-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-18 | 1966-02-17 | 1966-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-18 | 1970-02-17 | 1970-08-19 | $7700.00 | Window Closed / Lapsed |