Patent US3690255A successfully refreshed from Google Patents.
US3690255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid propellant cartridge
Assignee: United States Department of the Air Force
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Filing: 1970-10-01
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Granted: 1972-09-12
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Expires: 1990-10-01
Abstract
Abstract A system for controlled generation of high energy gas from a liquid propellant, based upon a differential area piston injecting liquid propellant into a combustion chamber in a regenerative cycle. One of its applications is for cartridge bomb ejection. Pressure of burning fuel fired by a primer ruptures seals in a piston wall and causes extrusion of liquid fuel from a reservoir area into the piston cavity which lies in the combustion area. Combustion of the extruded liquid carries on a regenerative process until all fuel in the reservoir has been consumed.
Inventors
- 👤 Edward J Vass
- 👤 Richard H Braun
- 👤 Conrad R Platt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:07
CPC Classifications
F; F42; F42B; F42B3/00; F42B3/04; F02; F02K; F02K9/00; F02K9/42; F02K9/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
260 words
A system for controlled generation of high energy gas from a liquid propellant comprising: a cylindrical casing having differential areas along its length, a close-fitting differential pisTon slidably disposed in said cylindrical casing, a reservoir chamber in said casing forward of said differential piston, a combustion chamber in the central area of said differential piston, a closure element fixedly attached to the rearward end of said casing for effectively sealing said combustion chamber, a primer housed in a recess in said closure element, said primer being in operative communication with said combustion chamber, a plurality of orifices in the closed forward end of said differential piston in communication with said reservoir chamber, said orifices being dimensioned to control the rate of flow of propellant into said combustion chamber, rupturable seals covering each of said orifices, and a vent opening in said casing between said piston and said closure element, said vent opening having a rupturable seal thereover for regulating the pressure in said combustion chamber, whereby the firing of said primer causes pressure to build up in said combustion chamber and rupture the vent opening seal while urging the piston forward until the seals covering the orifices in said differential piston are ruptured allowing liquid propellant in the reservoir chamber to pass into the combustion chamber at a controllable rate and be ignited by the residual combustion of the initial firing of said primer, thereby creating additional pressure and regenerating the process until all of the propellant in the reservoir chamber has flowed into the combustion chamber and been consumed.
Claim 2
Independent Claim
260 words
A system for controlled generation of high energy gas from a liquid propellant comprising: a cylindrical casing having differential areas along its length, a close-fitting differential pisTon slidably disposed in said cylindrical casing, a reservoir chamber in said casing forward of said differential piston, a combustion chamber in the central area of said differential piston, a closure element fixedly attached to the rearward end of said casing for effectively sealing said combustion chamber, a primer housed in a recess in said closure element, said primer being in operative communication with said combustion chamber, a plurality of orifices in the closed forward end of said differential piston in communication with said reservoir chamber, said orifices being dimensioned to control the rate of flow of propellant into said combustion chamber, rupturable seals covering each of said orifices, and a vent opening in said casing between said piston and said closure element, said vent opening having a rupturable seal thereover for regulating the pressure in said combustion chamber, whereby the firing of said primer causes pressure to build up in said combustion chamber and rupture the vent opening seal while urging the piston forward until the seals covering the orifices in said differential piston are ruptured allowing liquid propellant in the reservoir chamber to pass into the combustion chamber at a controllable rate and be ignited by the residual combustion of the initial firing of said primer, thereby creating additional pressure and regenerating the process until all of the propellant in the reservoir chamber has flowed into the combustion chamber and been consumed.
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) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |