Filter assembly
Abstract
Abstract A FILTER ASSEMBLY FOR LIBERATING AN AIR OR OTHER GASEOUS FLOW FROM DISCRETE SOLID PARTICLES SUCH AS DUST, THE FILTER MATERIAL OF WHICH IS IN THE FORM OF A BELLOWS INCLUDING ONE OR SEVERAL JOINED FOLDS, THE BELLOWS BEING OPEN AT THE UPSTREAM END AND CLOSED AT THE DOWNSTREAM END EITHER BY FILTER MATERIAL OR BY FLOW-IMPERVIOUS MATERIAL. THE FOLDS ASSUME A SUBSTANTIALLY CONTRACTED STATE WHEN THE FILTER ASSEMBLY IS INACTIVE, THAT IS, NOT EXPOSED TO IMPINGEMENT BY AN AIR FLOW AND ATE SUBSTANTIALLY ELONGATED IN DEPTH BY THE PRESSURE OF SUCH AIR FLOW THEREBY GREATLY INCREASING THE EFFECTIVE FILTER EREA. THE FOLDS RETURN TO THE SUBSTANTIALLY CONTRACTED STATE UPON CESSATION OF THE AIR FLOW, EITHER BY ELASTICITY OF THE FILTER MATERIAL OR BY MECHANICAL FORCE.
Inventors
- 👤 Louis Schwab
Bibliographic Details
Claims Analysis
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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) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |