Patent US4223606A successfully refreshed from Google Patents.
US4223606A
Expired / Lapsed
US
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Dual thrust rocket motor
Assignee: Aerojet Rocketdyne Inc
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Filing: 1978-08-21
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Granted: 1980-09-23
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Expires: 1998-08-21
Abstract
Abstract Dual thrust solid propellant rocket motor is described. The motor comprises a housing having a nozzle, a first propellant grain received by the housing, a second propellant grain arranged within the first propellant grain, and igniter means. The first propellant grain has projections extending into the second propellant grain for positive ignition.
Inventors
- 👤 Lawrence J. Bornstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:20
CPC Classifications
F; F02; F02K; F02K9/00; F02K9/08; F02K9/10; F02K9/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
176 words
A solid propellant rocket motor comprising: an elongated hollow housing having a longitudinal axis, an annulus shaped ring fixedly attached to the interior of said housing, said ring used to support stabilizing fins, a nozzle fixedly attached to said housing, an elongate sustainer propellant grain received by said housing and attached in abutting relation with the housing and ring concentric with the housing longitudinal axis, a booster propellant grain received by the said sustainer propellant grain arranged concentrically with the said housing longitudinal axis, and sustainer propellant grain having a plurality of ribs extending inwardly and in abutting relation with the said booster propellant grain, said booster propellant grain having a star shaped passageway positioned concentric with the housing longitudinal axis, an igniter fixedly attached to the housing and arranged within the booster propellant grain passageway, a layer of heat insulation applied to the internal wall of the housing, and a discontinuous film of parting compound between the heat insulation and the sustainer propellant grain forming a band at each end of the sustainer propellant grain.
Claim 2
Dependent Claim
176 words
A solid propellant rocket motor comprising: an elongated hollow housing having a longitudinal axis, an annulus shaped ring fixedly attached to the interior of said housing, said ring used to support stabilizing fins, a nozzle fixedly attached to said housing, an elongate sustainer propellant grain received by said housing and attached in abutting relation with the housing and ring concentric with the housing longitudinal axis, a booster propellant grain received by the said sustainer propellant grain arranged concentrically with the said housing longitudinal axis, and sustainer propellant grain having a plurality of ribs extending inwardly and in abutting relation with the said booster propellant grain, said booster propellant grain having a star shaped passageway positioned concentric with the housing longitudinal axis, an igniter fixedly attached to the housing and arranged within the booster propellant grain passageway, a layer of heat insulation applied to the internal wall of the housing, and a discontinuous film of parting compound between the heat insulation and the sustainer propellant grain forming a band at each end of the sustainer propellant grain.
References Cited (Backward Citations)
US2939275A
Cited
US3002459A
Cited
US2986001A
Cited
US2987880A
Cited
US3144829A
Cited
US2993648A
Cited
US2956401A
Cited
US3107620A
Cited
US3120184A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-09-23 | 1984-03-24 | 1984-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-23 | 1988-03-24 | 1988-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-23 | 1992-03-24 | 1992-09-23 | $7700.00 | Window Closed / Lapsed |