Patent US5151706A successfully refreshed from Google Patents.
US3572234A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air screen apparatus with filter removal means
Assignee: Individual
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Filing: 1969-04-24
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Granted: 1971-03-23
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Expires: 1989-04-24
Abstract
Abstract THE AIR SCREEN APPARATUS IS MOUNTED IN JUXTAPOSITION WITH RESPECT TO A STRUCTURE HAVING AN OPENING. FANS PROPEL THE AIR, LOUVRES DIRECT THE AIR ACROSS THE OPENING, AND A PAIR OF FILTER PANELS DISPOSED UPSTREAM FOM THE FANS ARE ANGULARLY SPACED WITH RESPECT TO EACH OTHER AND WITH RESPECT TO THE AIR STREAM. A MEMBER DISPOSED BETWEEN THE PANELS IS MOVABLE BETWEEN A FIRST POSITION WHEREIN IT COVERS THE INNER EDGES OF THE PANELS AND PERMITS WITHDRAWAL OF THE FIRST PANEL AND A SECOND POSITION WHEREIN IT PERMITS WITHDRAWAL OF SAID SECOND PANEL.
Inventors
- 👤 Edward P Schoenthaler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:18
CPC Classifications
F; F24; F24F; F24F9/00; F24F8/00; F24F8/10; F24F8/108
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) | 1974-03-22 | 1974-09-21 | 1975-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-22 | 1978-09-21 | 1979-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-22 | 1982-09-21 | 1983-03-23 | $7700.00 | Window Closed / Lapsed |