US3717256A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter frame construction
Assignee: American Air Filter Co Inc
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Filing: 1970-12-11
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Granted: 1973-02-20
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Expires: 1990-12-11
Abstract
Abstract A FILTER ASSEMBLY INCLUDING A RECTANGULAR FILTER FRAME WITH FILTER MEDIUM DISPOSED THEREIN, A BORDER FLANGE ARRANGED TO ENGAGE THE EDGE OF THE FILTER FRAME, THE BORDER FLANGE HAVING A TERMINAL FILTER MEDIUM RESTRAINING PORTION EXTENDING THEREFROM TO RESTRAIN THE PERIPHERY OF FILTER MEDIUM DISPOSED IN THE FRAME, AND ROD MEANS EXTENDING BETWEEN DIAMETRICALLY OPPOSED CORNERS OF THE BORDER FLANGE SIZE IN LENGTH TO RETAIN THE BORDER FLANGE ON THE FRAME WITH THE EXTREMITIES OF THE ROD MEANS CONNECTING THE RESTRAINING PORTIONS OF THE BORDER FLANGE. D R A W I N G
Inventors
- 👤 O Parrott
- 👤 G Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:35
CPC Classifications
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)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |