Patent US3341971A successfully refreshed from Google Patents.
US3341971A
Expired / Lapsed
US
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Fire damper
Assignee: AMERICAN WARMING AND VENTILATING Inc
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Filing: 1965-08-19
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Granted: 1967-09-19
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Expires: 1985-08-19
Abstract
No abstract record available.
Inventors
- 👤 Jr George F Hartman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:21
CPC Classifications
E; E06; E06B; E06B5/00; E06B5/10; E06B5/16; A; A62; A62C; A62C2/00; A62C2/06; A62C2/18; Y; Y10; Y10S; Y10S160/00; Y10S160/05; Y10T; Y10T292/00; Y10T292/03; Y10T292/08; Y10T292/1043; Y10T292/1063; Y10T292/1064; Y10T292/1072
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
A FIRE DAMPER COMPRISING A FRAME INCLUDING AT LEAST TWO SPACED FRAME MEMBERS, A PLURALITY OF FIRE DAMPER BLADES HAVING FIRST LONGITUDINAL FLANGES EXTENDING IN COMMON DIRECTIONS FROM CORRESPONDING EDGES THEREFROM, AN INTERMEDIATE FLANGE ON EACH OF SAID BLADES EXTENDING FROM AN INTERMEDIATE PORTION OF SAID BLADE IN A DIRECTION OPPOSITE THE FIRST FLANGE, AND INSULATING MEANS AFFIXED TO EACH OF SAID BLADES ADJACENT SAID INTERMEDIATE FLANGE AND ON THE SIDE OF SAID INTERMEDIATE FLANGE OPPOSITE THE FIRST FLANGE, THE INTERMEDIATE FLANGE OF ONE BLADE ENGAGING THE FIRST FLANGE OF AN ADJACENT BLADE WHEN THE DAMPER IS CLOSED AND THE BLADES ARE IN AN EXTENDED POSITION.
Claim 2
Dependent Claim
106 words
A FIRE DAMPER COMPRISING A FRAME INCLUDING AT LEAST TWO SPACED FRAME MEMBERS, A PLURALITY OF FIRE DAMPER BLADES HAVING FIRST LONGITUDINAL FLANGES EXTENDING IN COMMON DIRECTIONS FROM CORRESPONDING EDGES THEREFROM, AN INTERMEDIATE FLANGE ON EACH OF SAID BLADES EXTENDING FROM AN INTERMEDIATE PORTION OF SAID BLADE IN A DIRECTION OPPOSITE THE FIRST FLANGE, AND INSULATING MEANS AFFIXED TO EACH OF SAID BLADES ADJACENT SAID INTERMEDIATE FLANGE AND ON THE SIDE OF SAID INTERMEDIATE FLANGE OPPOSITE THE FIRST FLANGE, THE INTERMEDIATE FLANGE OF ONE BLADE ENGAGING THE FIRST FLANGE OF AN ADJACENT BLADE WHEN THE DAMPER IS CLOSED AND THE BLADES ARE IN AN EXTENDED POSITION.
References Cited (Backward Citations)
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US866170A
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US916288A
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US1095152A
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US3204691A
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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) | 1970-09-18 | 1971-03-20 | 1971-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-18 | 1975-03-20 | 1975-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-18 | 1979-03-20 | 1979-09-19 | $7700.00 | Window Closed / Lapsed |