US3552101A
Expired / Lapsed
US
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Assignee: Air Maze Corp
•
Filing: 1969-01-23
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Granted: 1971-01-05
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Expires: 1989-01-23
Abstract
Abstract D R A W I N G UNITS, EACH EMBODYING SUCH A WEB, CAN BE MOUNTED IN ALIGNMENT AND HAVE THEIR TAKE UP ROLLS DRIVE CONNECTED FOR CONCOMITANT ADVANCEMENT EITHER MANUALLY OR BY A POWERED DRIVE TRAIN. AN AIR FILTER APPARATUS OF THE TYPE UTILIZING AS A DISPOSABLE FILTER MEDIUM AT LEAST ONE WEB OF PERMEABLE MATERIAL WHICH IS FED FROM A SUPPLY ROLL THROUGH AN AIR FILTER ZONE TO A TAKE UP ROLL IN WHICH THE TAKE UP ROLL IS SO SUPPORTED THAT THE TAKE UP ROLL CAN BE READILY AND RAPIDLY REPLACED AND ALSO SO THAT A SERIES OF SIMILAR
Inventors
- 👤 Louis S Papp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:45
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/18
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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |