US3830307A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fire prevention and/or suppression system
Assignee: Parker Hannifin Corp
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Filing: 1973-01-22
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Granted: 1974-08-20
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Expires: 1993-01-22
Abstract
Abstract A fire prevention and/or suppression system in which liquid nitrogen is injected into a space to be protected against fire and/or explosion. The nitrogen vaporizes in the space and mixes with the combustible gases therein to extinguish flame that may be present and/or render the gases non-flammable to prevent their ignition, and also quickly cools the gases and/or other combustible material that may be present to protect against ignition or re-ignition.
Inventors
- 👤 K Bragg
- 👤 R Nichols
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:34
CPC Classifications
A; A62; A62C; A62C99/00; A62C99/0009; A62C3/00; A62C3/06; A62C3/07; A62C3/08; B; B64; B64D; B64D37/00; B64D37/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
160 words
A system for preventing and/or extinguishing fire in a gaseous space within a closed container, comprising a dewar containing a cryogenic fluid, a portion of said fluid being in liquid form and another portion being in gaseous form that exerts pressure on the liquid, a conduit connecting the liquid containing portion of said dewar to a fog nozzle communicating directly with said space, said gaseous fluid providing the only source of pressure for moving said liquid from the dewar through the conduit and the fog nozzle to said space, said fog nozzle delivering said liquid to said space in finely divided liquid droplets, a valve in said conduit controlling flow of said cryogenic liquid from the dewar through said conduit to said fog nozzle, means for detecting a fire in said space and for opening said valve in response to said detection, and a one-way vent valve for venting excess gas from the container to prevent overpressurization of the container.
Claim 2
Independent Claim
160 words
A system for preventing and/or extinguishing fire in a gaseous space within a closed container, comprising a dewar containing a cryogenic fluid, a portion of said fluid being in liquid form and another portion being in gaseous form that exerts pressure on the liquid, a conduit connecting the liquid containing portion of said dewar to a fog nozzle communicating directly with said space, said gaseous fluid providing the only source of pressure for moving said liquid from the dewar through the conduit and the fog nozzle to said space, said fog nozzle delivering said liquid to said space in finely divided liquid droplets, a valve in said conduit controlling flow of said cryogenic liquid from the dewar through said conduit to said fog nozzle, means for detecting a fire in said space and for opening said valve in response to said detection, and a one-way vent valve for venting excess gas from the container to prevent overpressurization of the container.
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) | 1977-08-19 | 1978-02-18 | 1978-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-19 | 1982-02-18 | 1982-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-19 | 1986-02-18 | 1986-08-20 | $7700.00 | Window Closed / Lapsed |