Patent US5162292A successfully refreshed from Google Patents.
US3973397A
Expired / Lapsed
US
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Rocket motor with ablative insulating casing liner
Assignee: Imperial Metal Industries Kynoch Ltd
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Filing: 1974-01-17
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Granted: 1976-08-10
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Expires: 1994-01-17
Abstract
Abstract A solid propellant rocket motor is provided with a liner between the motor case and the propellant, the liner comprising a terpolymer of ethylene, propylene and a nonconjugated diene and inert fillers. Ablative fillers such as heavy metal halides, calcium hydroxide and magnesium hydroxide may be included.
Inventors
- 👤 Michael John Chase
- 👤 Derek Anthony Smith
- 👤 Michael Alan Dudley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:46
CPC Classifications
C; C06; C06B; C06B45/00; C06B45/12; F; F02; F02K; F02K9/00; F02K9/08; F02K9/32; F02K9/34; F02K9/346
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
93 words
A rocket motor cas having an insulating liner bonded to the inner surface of the case, said liner comprising a cured elastomer containing 75-100 parts of a terpolymer of ethylene, propylene and a non-conjugated diene, up to 25 parts of at least one other elastomer, 40 to 100 parts of an inert filler material selected from the group consisting of silica and asbestos and 20-80 parts of ablative filler materials other than lead chloride which will decompose at temperatures near to or above the decomposition temperature of the elastomer content of the liner.
Claim 2
Dependent Claim
93 words
A rocket motor cas having an insulating liner bonded to the inner surface of the case, said liner comprising a cured elastomer containing 75-100 parts of a terpolymer of ethylene, propylene and a non-conjugated diene, up to 25 parts of at least one other elastomer, 40 to 100 parts of an inert filler material selected from the group consisting of silica and asbestos and 20-80 parts of ablative filler materials other than lead chloride which will decompose at temperatures near to or above the decomposition temperature of the elastomer content of the liner.
Claim 3
Dependent Claim
14 words
A rocket motor case as in claim 1 wherein the nonconjugated diene is dicyclopentadiene.
Claim 4
Dependent Claim
14 words
A rocket motor case as in claim 1 wherein the nonconjugated diene is cyclooctadiene.
Claim 5
Dependent Claim
18 words
A rocket motor case as in claim 1 wherein said liner includes chlorosulphonated polyethylene as said other elastomer.
Claim 6
Dependent Claim
28 words
A rocket motor case as in claim 1 wherein the ablative filler material is selected from the group consisting of heavy metal halides, magnesium hydroxide and calcium hydroxide.
Claim 7
Dependent Claim
106 words
A rocket motor case having an insulating liner bonded to the inner surface of the case, said liner comprising a cured elastomer containing 75-100 parts of a terpolymer of ethylene, propylene and a non-conjugated diene, up to 25 parts of at least one other elastomer, 40 to 100 parts of an inert filler material selected from the group consisting of silica and asbestos and 20-80 parts of ablative filler materials which have endothermic heats of decomposition greater than that of the elastomer content of the liner and which will decompose at temperatures near to or above the decomposition temperature of the elastomer content of the liner.
Claim 8
Dependent Claim
106 words
A rocket motor case having an insulating liner bonded to the inner surface of the case, said liner comprising a cured elastomer containing 75-100 parts of a terpolymer of ethylene, propylene and a non-conjugated diene, up to 25 parts of at least one other elastomer, 40 to 100 parts of an inert filler material selected from the group consisting of silica and asbestos and 20-80 parts of ablative filler materials which have endothermic heats of decomposition greater than that of the elastomer content of the liner and which will decompose at temperatures near to or above the decomposition temperature of the elastomer content of the liner.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-10 | 1980-02-09 | 1980-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-10 | 1984-02-09 | 1984-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-10 | 1988-02-09 | 1988-08-10 | $7700.00 | Window Closed / Lapsed |