US3073525A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic ventilator for buildings
Assignee: THERMVENT CORP
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Filing: 1961-01-03
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Granted: 1963-01-15
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Expires: 1981-01-03
Abstract
No abstract record available.
Inventors
- 👤 Casimer J Cislo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:48
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/01; G05D23/02; G05D23/021; F; F24; F24F; F24F11/00; F24F11/70; F24F11/72; F24F11/74; F24F11/76
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
136 words
IN AN AUTOMATIC VENTILATOR FOR A BUILDING HAVING A VENT OPENING, A GRILLE FRAME ADAPTED TO BE MOUNTED IN SAID OPENING AND HAVING A PLURALITY OF OPENINGS THEREIN, AN APERTURED SHUTTER SLIDABLY MOUNTED UPON SAID GRILLE FRAME NORMALLY CLOSING SAID GRILLE FRAME OPENINGS, THERMOSTATIC CONTROL MEANS OPERATIVELY MOUNTED BETWEEN SAID GRILLE FRAME AND SHUTTER FOR SELECTIVELY OPENING AND CLOSING SAID SHUTTER AS DETERMINED TEMPERATURES, SAID THERMOSTATIC CONTROL MEANS INCLUDING A HOUSING MOUNTED ON SAID SHUTTER LONGITUDINALLY AND AT ONE END THEREOF, A TEMPERATURE RESPONSIVE MEANS IN SAID HOUSING INCLUDING A RECIPROCAL PISTON ROD PROJECTED LONGITUDINALLY FROM SAID HOUSING FOR OPERATIVE ENGAGEMENT WITH SAID GRILLED FRAME, MOVABLE IN ONE DIRECTION FOR OPENING THE SHUTTER, AND A COILED SPRING INTERPOSED BETWEEN SAID SHUTTER AND FRAME FOR CLOSING SAID SHUTTER ON MOVEMENT OF SAID ROD IN THE OPPOSITE DIRECTION.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-01-14 | 1966-07-16 | 1967-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-14 | 1970-07-16 | 1971-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-14 | 1974-07-16 | 1975-01-15 | $7700.00 | Window Closed / Lapsed |