Air filter containing filter bags
Abstract
Abstract THE TOP AND BOTTOM AND SIDES OF AN UPRIGHT RECTANGULAR OUTER FRAME ARE PROVIDED WITH LONGITUDINAL CHANNELS OPENING TOWARD THE INSIDE OF THE FRAME. GLUED INTO THESE CHANNELS IN A GASKET. FILTER BAGS BEHIND THE FRAME HAVE OPEN ENDS DISPOSED SIDE BY SIDE INSIDE THE FRAME. THE TOP AND BOTTOM PORTIONS OF THE GASKET ARE GLUED TO THE ADJOINING ENDS OF THE BAGS. A NARROW RECTANGULAR INNER FRAME IS INSERTED IN THE OPEN END OF EACH BAG WITH ITS TOP AND BOTTOM HELD IN THE TOP AND BOTTOM CHANNELS. A U-SHAPED CLAMPING STRIP IS DISPOSED IN EACH SIDE CHANNEL AND STRADDLES THE OUTER SIDES OF THE ADJOINING BAG AND INNER FRAME TO CLAMP THEM TOGETHER. THE OUTER SIDE OF EACH CLAMPING STRIP IS GLUED TO THE ADJOINING SIDE PORTION OF THE GASKET.
Inventors
- 👤 Harry N Cotabish
- 👤 Frank W Smith
- 👤 Wayne L Smith
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |