Patent US3742710A successfully refreshed from Google Patents.
US3742710A
Expired / Lapsed
US
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Termination fluids for solid stop-start propellant rocket motors
Assignee: RTX Corp
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Filing: 1969-08-15
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Granted: 1973-07-03
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Expires: 1989-08-15
Abstract
Abstract Thrust termination fluids for extinguishing a solid propellant rocket motor have dissolved therein a solid oxidizing agent which is deposited on the surface of the extinguished propellant to facilitate reignition of the motor. Suitable termination fluids include; water, alcohols, water-ammonia solutions and hydrazineammonia solutions and water-alcohol solutions. Suitable oxidizers to be dissolved in the fluids include nitrate and perchlorate oxidizing salts.
Inventors
- 👤 J Trowbridge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:40
CPC Classifications
F; F02; F02K; F02K9/00; F02K9/80; F02K9/92; F02K9/94
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
88 words
In a method for the stop-start operation of a solid propellant gas generator which comprises igniting the surface of a solid propellant grain contained within a combustion chamber provided with a port from which combustion products may escape, quenching the combustion process by injecting a fluid into the combustion chamber and reigniting the extinguished surface of said solid propellant grain; the improvement wherein said fluid has dissolved therein an amount of a solid oxidizing agent selected from the group consisting of ammonium and alkali metal nitrates and perchlorates.
Claim 2
Dependent Claim
16 words
The process of claim 2 wherein said extinguishing fluid has a freezing point below -65* F.
Claim 3
Dependent Claim
40 words
The process of claim 3 wherein said fluid is selected from the group consisting of methanol, ethanol, n-propanol, isopropanol, n-butyl alcohol, isobutyl alcohol, sec butyl alcohol, ethylene glycol, glycerin, aqueous solution of the aforementioned alcohols, and aqueous solutions of NH3.
References Cited (Backward Citations)
US2949006A
Cited
US3354647A
Cited
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 |