Patent US4087823A successfully refreshed from Google Patents.
Patent US3688988A successfully refreshed from Google Patents.
US3688988A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disposable rocket motor nozzle
Assignee: United States Department of the Army
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Filing: 1970-12-14
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Granted: 1972-09-05
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Expires: 1990-12-14
Abstract
Abstract A disposable rocket motor nozzle that has a converging diverging throat portion with a shaped charge wound about the throat portion to be ignited by conventional igniter means to cause the throat portion to be broken up into small pieces when it is desired to destroy the nozzle.
Inventors
- 👤 James F Howison
- 👤 Chester A Friend Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:20
CPC Classifications
F; F42; F42B; F42B15/00; F42B15/36; F42B15/38; F02; F02K; F02K9/00; F02K9/08; F02K9/32; F02K9/34
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
109 words
A disposable rocket motor nozzle comprising a converging diverging nozzle body portion, a shaped charge wound about the outer periphery of said nozzle body portion for directing its explosive force toward said nozzle body portion, a thermal barrier of asbestos mounted on the outer periphery of said nozzle body portion to separate said shaped charge from said nozzle body portion, a housing about said nozzle body portion so as to inclose said shaped charge relative to said nozzle body portion, and a filler material between said shaped charge and said housing to act as shock absorber and thermal barrier to protect the housing when the shaped charge is detonated.
Claim 2
Dependent Claim
109 words
A disposable rocket motor nozzle comprising a converging diverging nozzle body portion, a shaped charge wound about the outer periphery of said nozzle body portion for directing its explosive force toward said nozzle body portion, a thermal barrier of asbestos mounted on the outer periphery of said nozzle body portion to separate said shaped charge from said nozzle body portion, a housing about said nozzle body portion so as to inclose said shaped charge relative to said nozzle body portion, and a filler material between said shaped charge and said housing to act as shock absorber and thermal barrier to protect the housing when the shaped charge is detonated.
Claim 3
Dependent Claim
55 words
A disposable rocket motor nozzle as set forth in claim 1 wherein, said nozzle body portion is made of a material selected from the group consisting of an asbestos-phenolic, a paper-phenolic, a glass-phenolic, and ceramic, and wherein said nozzle body portion has a throat insert secured therein and said throat insert is made of graphite.
Claim 4
Dependent Claim
65 words
A disposable rocket motor nozzle as set forth in claim 2 wherein, said shaped charge is a flexible linear shaped charge and said shaped charge is wound about said nozzle body portion by being wound one complete revolution near each end of said nozzle body portion, the remainder of said shaped charge being wound about said nozzle body portion in the form of a helix.
Claim 5
Dependent Claim
29 words
A disposable rocket motor nozzle as set forth in claim 3 wherein, said filler material is selected from the group consisting of expanded polystyrene epoxy foam, and phenolic microballoon.
Claim 6
Dependent Claim
20 words
A disposable rocket motor nozzle as set forth in claim 3 wherein, said nozzle body portion is made of asbestos-phenolic.
Claim 7
Dependent Claim
21 words
A disposable rocket motor nozzle as set forth in claim 3 wherein, said nozzle body portion is made of a glass-phenolic.
Claim 8
Dependent Claim
21 words
A disposable rocket motor nozzle as set forth in claim 1 wherein, said nozzle body portion is made of ceramic material.
Claim 9
Dependent Claim
97 words
A disposable rocket motor nozzle as set forth in claim 1 wherein, said nozzle body portion outer periphery converges radially inwardly from one end of said nozzle body portion and then diverges radially outwardly to the other end of said nozzle body portion, and said shaped charge is a flexible linear shaped charge with said shaped charge being wound about said nozzle body portion by being wound one complete revolution near each end of said nozzle body portion, the remainder of said shaped charge being wound about said nozzle body portion in the form of a helix.
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) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |