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Patent US4492779A successfully refreshed from Google Patents.
US4492779A
Expired / Lapsed
US
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Aramid polymer and powder filler reinforced elastomeric composition for use as a rocket motor insulation
Assignee: ATK Launch Systems LLC
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Filing: 1981-12-07
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Granted: 1985-01-08
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Expires: 2001-12-07
Abstract
Abstract An elastomeric composition suitable for use as a rocket motor case insulation is disclosed. The composition consists of a vulcanizable elastomeric composition and reinforcing aramid polymer fibers in combination with a powder filler. A preferred embodiment utilizes polyisoprene as the elastomer, KELVAR TM fibers as the aramid polymer fibers, and silica as the powder filler.
Inventors
- 👤 Kenneth E. Junior
- 👤 James D. Byrd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:05
CPC Classifications
F; F02; F02K; F02K9/00; F02K9/08; F02K9/32; F02K9/34; F02K9/346; C; C08; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C08K3/34; C08K3/36; C08K3/40; C08K7/00; C08K7/02; C08L; C08L21/00; C08L77/00; C08L77/10; C08L81/00; C08L81/04; C08L83/00; C08L83/04; C08L9/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
85 words
A process for insulating a solid propellant rocket motor, comprising the step of employing an essentially asbestos-free elastomeric composition as an insulating liner, said composition comprising: A. from 1 to 40 percent by weight of aramid polymer fibers, B. from 1 to 75 percent by weight of a powder filler selected from the group consisting of silica, iron oxide, titanium oxide, carbon, milled glass, and ceramic clays, and C. A vulcanizable elastomeric composition including: (i) a vulcanizable elastomer, and (ii) vulcanizing agents for said elastomer.
Claim 2
Dependent Claim
85 words
A process for insulating a solid propellant rocket motor, comprising the step of employing an essentially asbestos-free elastomeric composition as an insulating liner, said composition comprising: A. from 1 to 40 percent by weight of aramid polymer fibers, B. from 1 to 75 percent by weight of a powder filler selected from the group consisting of silica, iron oxide, titanium oxide, carbon, milled glass, and ceramic clays, and C. A vulcanizable elastomeric composition including: (i) a vulcanizable elastomer, and (ii) vulcanizing agents for said elastomer.
Claim 3
Dependent Claim
19 words
The process of claim 1 wherein the aramid polymer fiber content ranges from 17 to 28 percent by weight.
Claim 4
Dependent Claim
11 words
The process of claim 1 wherein said vulcanizable elastomer is polyisoprene.
Claim 5
Dependent Claim
23 words
The process of claim 1 wherein said powder filler is composed of particles having an average particle size of at least 30 millimicrons.
Claim 6
Dependent Claim
12 words
The process of claim 1 wherein said vulcanizable elastomer is polyacrylonitrile rubber.
Claim 7
Dependent Claim
12 words
The process of claim 1 wherein said vulcanizable elastomer is butyl rubber.
Claim 8
Dependent Claim
13 words
The process of claim 1 wherein said vulcanizable elastomer is a butadiene-styrene copolymer.
Claim 9
Dependent Claim
12 words
The process of claim 1 wherein said vulcanizable elastomer is nitrile rubber.
Claim 10
Dependent Claim
11 words
The process of claim 1 wherein said vulcanizable elastomer is polybutadiene.
Claim 11
Dependent Claim
12 words
The process of claim 1 wherein said vulcanizable elastomer is silicone rubber.
Claim 12
Dependent Claim
12 words
The process of claim 1 wherein said vulcanizable elastomer is chlorosulfonated polyethylene.
Claim 13
Dependent Claim
13 words
The process of claim 1 wherein said vulcanizable elastomer is a fluorocarbon polymer.
Claim 14
Dependent Claim
14 words
The process of claim 1 wherein said vulcanizable elastomer is an ethylene-propylene diene monomer.
Claim 15
Dependent Claim
12 words
The process of claim 1 wherein said vulcanizable elastomer is a polysulfide.
Claim 16
Dependent Claim
11 words
The process of claim 1 wherein said vulcanizable elastomer is neoprene.
Claim 17
Dependent Claim
12 words
The process of claim 1 wherein said vulcanizable elastomer is a polyurethane.
Claim 18
Dependent Claim
11 words
The process of claim 1, wherein said powder filler is silica.
Claim 19
Dependent Claim
86 words
A process for insulating a solid propellant rocket motor, comprising the step of employing an essentially asbestos-free elastomeric composition as an insulating liner, said composition consisting essentially of: A. from 1 to 40 percent by weight of aramid polymer fibers; B. from 1 to 75 percent by weight of powder filler selected from the group consisting of silica, iron oxide, titanium oxide, carbon, milled glass, and ceramic clays; and C. A vulcanizable elastomeric composition including (i) a vulcanizable elastomer, and (ii) vulcanizing agents for said elastomer.
Claim 20
Dependent Claim
86 words
A process for insulating a solid propellant rocket motor, comprising the step of employing an essentially asbestos-free elastomeric composition as an insulating liner, said composition consisting essentially of: A. from 1 to 40 percent by weight of aramid polymer fibers; B. from 1 to 75 percent by weight of powder filler selected from the group consisting of silica, iron oxide, titanium oxide, carbon, milled glass, and ceramic clays; and C. A vulcanizable elastomeric composition including (i) a vulcanizable elastomer, and (ii) vulcanizing agents for said elastomer.
Claim 21
Dependent Claim
11 words
The process of claim 18, wherein said powder filler is silica.
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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) | 1988-01-08 | 1988-07-09 | 1989-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-08 | 1992-07-09 | 1993-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-08 | 1996-07-09 | 1997-01-08 | $7700.00 | Window Closed / Lapsed |