US2664172A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air filter construction
Assignee: Owens Corning
•
Filing: 1951-06-07
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Granted: 1953-12-29
•
Expires: 1971-06-07
Abstract
No abstract record available.
Inventors
- 👤 Charles E Butterfield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:55
CPC Classifications
F; F24; F24F; F24F13/00; F24F13/28; B; B01; B01D; B01D46/00; B01D46/10; Y; Y10; Y10S; Y10S55/00; Y10S55/31
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2160003A
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US2008751A
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US2044221A
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US2108283A
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US2062090A
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US2513946A
Cited
US2569575A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-12-28 | 1957-06-29 | 1957-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-28 | 1961-06-29 | 1961-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-28 | 1965-06-29 | 1965-12-29 | $7700.00 | Window Closed / Lapsed |