US3968646A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Noise controllable nozzle closure
Assignee: United States Department of the Army
•
Filing: 1974-06-28
•
Granted: 1976-07-13
•
Expires: 1994-06-28
Abstract
Abstract A rocket motor nozzle closure for controlling the initial release of prese from the rocket motor nozzle to reduce the occurrence of high pressure shock fronts which are detrimental to the weapon operator. The mass and geometry of the nozzle closure are predetermined to fit the desired motor performance. The release of motor pressure is controlled by the rate of change of momentum of the nozzle closure.
Inventors
- 👤 Robert E. Betts
- 👤 Lawrence B. Thorn
- 👤 Albert R. Maykut
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:21
CPC Classifications
F; F02; F02K; F02K9/00; F02K9/97; F02K9/978
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
In a rocket motor having a nozzle including an entrance section, a throat section and an exit section, closure means for controlling the opening of said nozzle responsive to ignition of said rocket motor comprising: a. a forward section disposed in said entrance section of said nozzle, said forward section having an ogival configuration having helical grooves on the outer surface thereof; b. an intermediate section disposed in said throat section; and, c. an aft section disposed in said exit section of said nozzle, said aft section having a solid frusto-conical configuration.
Claim 2
Dependent Claim
92 words
In a rocket motor having a nozzle including an entrance section, a throat section and an exit section, closure means for controlling the opening of said nozzle responsive to ignition of said rocket motor comprising: a. a forward section disposed in said entrance section of said nozzle, said forward section having an ogival configuration having helical grooves on the outer surface thereof; b. an intermediate section disposed in said throat section; and, c. an aft section disposed in said exit section of said nozzle, said aft section having a solid frusto-conical configuration.
References Cited (Backward Citations)
US2828604A
Cited
US3020710A
Cited
US3170288A
Cited
US3121310A
Cited
US3228334A
Cited
US3372548A
Cited
US3468127A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-13 | 1980-01-12 | 1980-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-13 | 1984-01-12 | 1984-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-13 | 1988-01-12 | 1988-07-13 | $7700.00 | Window Closed / Lapsed |