Patent US3230536A successfully refreshed from Google Patents.
US3172347A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Universal fire damper with angular axle
Assignee: AMERICAN WARMING AND VENTILATING Inc
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Filing: 1962-11-13
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Granted: 1965-03-09
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Expires: 1982-11-13
Abstract
No abstract record available.
Inventors
- 👤 Edward H Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:21
CPC Classifications
A; A62; A62C; A62C2/00; A62C2/06; A62C2/24; A62C2/241; A62C2/242; A62C2/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
204 words
IN A FIRE DAMPER COMPRISING: AN UPPER FRAME MEMBER, A LOWER FRAME MEMBER, TWO SIDE FRAME MEMBERS, A DAMPER BLADE, A PAIR OF AXLES HAVING ELONGATE TRANSVERSE CROSS SECTIONS EXTENDING OUTWARDLY BEYOND THE SIDE EDGES OF SAID DAMPER BLADE, EACH OF SAID SIDE FRAME MEMBERS HAVING A GENERALLY CIRCULAR OPENING TO PIVOTALLY RECEIVE ONE OF SAID AXLES, EACH OF SAID SIDE FRAME MEMBRS ALSO HAVING AN ELONGATE NOTCH WITH AN END COMMUNICATING WITH THE CIRCULAR OPENING, SAID NOTCHES AND SAID AXLES BEING PARALLEL AND SAID AXLES BEING RECEIVED IN SAID NOTCHES AND PREVENTED FROM ROTATION THEREBY WHEN SAID DAMPER BLADE IS CLOSED, A FIRST STOP ASSOCIATED WITH THE UPPER FRAME MEMBER, A SECOND STOP ASSOCIATED WITH THE LOWER FRAME MEMBER, SAID STOPS ENGAGING SAID DAMPER BLADE WHEN CLOSED AND DETERMINING THE CLOSED POSITION OF SAID BLADE, THE IMPROVEMENT COMPRISING SAID NOTCHES LYING AT AN ANGLE TO THE LONGITUDINAL EXTENT OF SAID SIDE FRAME MEMBERS, SAID ELONGATE AXLES LYING AT THE SAME ANGLE AS SAID NOTCHES WHEN SAID BLADE IS CLOSED WHEREBY SAID AXLES WILL MOVE INTO SAID NOTCHES WHEN SAID BLADE IS CLOSED BECAUSE OF THE WEIGHT OF SAID BLADE, WHEN SAID DAMPERS ARE INSTALLED IN ANY POSITION BETWEEN AND INCLUDING HORIZONTAL AND VER-
Claim 2
Dependent Claim
204 words
IN A FIRE DAMPER COMPRISING: AN UPPER FRAME MEMBER, A LOWER FRAME MEMBER, TWO SIDE FRAME MEMBERS, A DAMPER BLADE, A PAIR OF AXLES HAVING ELONGATE TRANSVERSE CROSS SECTIONS EXTENDING OUTWARDLY BEYOND THE SIDE EDGES OF SAID DAMPER BLADE, EACH OF SAID SIDE FRAME MEMBERS HAVING A GENERALLY CIRCULAR OPENING TO PIVOTALLY RECEIVE ONE OF SAID AXLES, EACH OF SAID SIDE FRAME MEMBRS ALSO HAVING AN ELONGATE NOTCH WITH AN END COMMUNICATING WITH THE CIRCULAR OPENING, SAID NOTCHES AND SAID AXLES BEING PARALLEL AND SAID AXLES BEING RECEIVED IN SAID NOTCHES AND PREVENTED FROM ROTATION THEREBY WHEN SAID DAMPER BLADE IS CLOSED, A FIRST STOP ASSOCIATED WITH THE UPPER FRAME MEMBER, A SECOND STOP ASSOCIATED WITH THE LOWER FRAME MEMBER, SAID STOPS ENGAGING SAID DAMPER BLADE WHEN CLOSED AND DETERMINING THE CLOSED POSITION OF SAID BLADE, THE IMPROVEMENT COMPRISING SAID NOTCHES LYING AT AN ANGLE TO THE LONGITUDINAL EXTENT OF SAID SIDE FRAME MEMBERS, SAID ELONGATE AXLES LYING AT THE SAME ANGLE AS SAID NOTCHES WHEN SAID BLADE IS CLOSED WHEREBY SAID AXLES WILL MOVE INTO SAID NOTCHES WHEN SAID BLADE IS CLOSED BECAUSE OF THE WEIGHT OF SAID BLADE, WHEN SAID DAMPERS ARE INSTALLED IN ANY POSITION BETWEEN AND INCLUDING HORIZONTAL AND VER-
References Cited (Backward Citations)
US2270073A
Cited
US2287262A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-03-08 | 1968-09-07 | 1969-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-08 | 1972-09-07 | 1973-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-08 | 1976-09-07 | 1977-03-09 | $7700.00 | Window Closed / Lapsed |