Patent US3285153A successfully refreshed from Google Patents.
US3285153A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Building ventilating system
Assignee: HARTSOUGH Manufacturing Co
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Filing: 1964-09-08
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Granted: 1966-11-15
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Expires: 1984-09-08
Abstract
No abstract record available.
Inventors
- 👤 Russell E Hartsough
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:26
CPC Classifications
F; F24; F24F; F24F7/00; F24F7/007
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
101 words
IN A VENTILATING SYSTEM FOR A BUILDING HAVING A ROOF AND WALLS AND A LIVING SPACE: AN AIR OUTLET STRUCTURE DISPOSED ALONG THE UPPER EDGE OF SAID WALLS AND HAVING AN INLET OPENING DISPOSED ALONG THE UPPER INSIDE EDGE OF SAID WALLS AND AN OUTLET OPENING DISPOSED ALONG THE UPPER OUTSIDE EDGE OF SAID WALLS, MEANS FORMING A PASSAGE CONNECTING SAID OPENINGS, A VALVE MEANS IN SAID PASSAGE FOR PREVENTING BACKFLOW OF AIR THROUGH SAID PASSAGE, AND AN AIR INLET STRUCTURE HAVING A POWER MEANS FOR FORCING AIR DOWNWARDLY INTO SAID LIVING SPACE AND THEREFROM OUTWARD THROUGH SAID AIR OUTLET STRUCTURE.
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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) | 1969-11-14 | 1970-05-16 | 1970-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-14 | 1974-05-16 | 1974-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-14 | 1978-05-16 | 1978-11-15 | $7700.00 | Window Closed / Lapsed |