US3743022A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fire protection system
Assignee: Factory Mutual Research Corp
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Filing: 1971-04-26
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Granted: 1973-07-03
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Expires: 1991-04-26
Abstract
Abstract A system for protecting a structure and its contents from fire wherein a plurality of extinguishant discharge heads are disposed in the space defined by the structure, with each head being responsible for a particular portion of said space. A fire responsive device is automatically responsive to a predetermined temperature existing in one or more portions of the space at a distance of less than six inches from the ceiling of the structure, for actuating the head responsible for the space and causing a resultant discharge of extinguishant from the head.
Inventors
- 👤 W Livingston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:34
CPC Classifications
A; A62; A62C; A62C37/00; A62C37/08; A62C37/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
199 words
A system for protecting an enclosed structure having a ceiling from fire, comprising a plurality of heads located in said structure for discharging extinguishant directly towards said fire, each head being responsible for a particular portion of said space, means for delivering extinguishant from a source of supply to each of said heads, a thermal fuse member associated with each head and located less than six inches from said ceiling so that at least a portion of said fuse members will be directly exposed to the layer of hot gases that move in a generally horizontal direction along said ceiling as a result of a fire occurring at a random location in said structure, each thermal fuse member being adapted to fuse at a temperature of at least 500*F. so that the fuse members located generally over said fire will be fused while the fuse members spaced a predetermined horizontal distance from said fire will not be fused, and means associated with each of said heads for normally preventing the discharge of extinguishant from said heads, said latter means being responsive to said fusing of said thermal fuse members for permitting the discharge of extinguishant from their respective heads.
Claim 2
Independent Claim
199 words
A system for protecting an enclosed structure having a ceiling from fire, comprising a plurality of heads located in said structure for discharging extinguishant directly towards said fire, each head being responsible for a particular portion of said space, means for delivering extinguishant from a source of supply to each of said heads, a thermal fuse member associated with each head and located less than six inches from said ceiling so that at least a portion of said fuse members will be directly exposed to the layer of hot gases that move in a generally horizontal direction along said ceiling as a result of a fire occurring at a random location in said structure, each thermal fuse member being adapted to fuse at a temperature of at least 500*F. so that the fuse members located generally over said fire will be fused while the fuse members spaced a predetermined horizontal distance from said fire will not be fused, and means associated with each of said heads for normally preventing the discharge of extinguishant from said heads, said latter means being responsive to said fusing of said thermal fuse members for permitting the discharge of extinguishant from their respective heads.
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) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |