Patent US3960088A successfully refreshed from Google Patents.
US3960088A
Expired / Lapsed
US
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Case bonding composite for double base propellants
Assignee: United States Department of the Navy
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Filing: 1970-02-26
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Granted: 1976-06-01
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Expires: 1990-02-26
Abstract
Abstract A two layer composite for case bonding double base propellants. The layer next to the case and internal components comprises a neoprene or vinyl chloride-vinyl acetate copolymer formulation which includes triphenylmethane triisocyanate and the propellant adhesive layer comprises polyvinyl formal cross-linked with titanium acetylacetonate or 2,4-tolylene diisocyanate.
Inventors
- 👤 Willis L. Greever
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:44
CPC Classifications
C; C06; C06B; C06B45/00; C06B45/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
68 words
A two layer case bonding composite for double base propellants comprising: 1. a first layer comprising neoprene, phenyl β-naphthalamine, zinc oxide, a neoprene stabilizer, an oil soluble phenolic resin and triphenylmethane triisocyanate, and 2. a second layer, bonded to said first layer, comprising polyvinyl formal and a curing agent selected from the group consisting of titanium acetylacetonate and 2,4-tolylene diisocyanate wherein both layers are in the cured state.
Claim 2
Dependent Claim
68 words
A two layer case bonding composite for double base propellants comprising: 1. a first layer comprising neoprene, phenyl β-naphthalamine, zinc oxide, a neoprene stabilizer, an oil soluble phenolic resin and triphenylmethane triisocyanate, and 2. a second layer, bonded to said first layer, comprising polyvinyl formal and a curing agent selected from the group consisting of titanium acetylacetonate and 2,4-tolylene diisocyanate wherein both layers are in the cured state.
Claim 3
Dependent Claim
37 words
A case bonding system for double base propellants as described in claim 1 wherein the neoprene containing layer is attached to a material selected from the group consisting of styrene-butadiene rubber, buna-N, polyisoprene and ethylene-propylene terpolymer elastomers.
Claim 4
Dependent Claim
67 words
A two layer case bonding composite for double base propellants comprising: 1. a first layer comprising vinyl chloride-vinyl acetate copolymer, triphenylmethane triisocyanate and a lower dialkyl ester of a dicarboxylic acid, and 2. a second layer, bonded to said first layer comprising polyvinyl formal and a curing agent selected from the group consisting of titanium acetylacetonate and 2,4-tolylene diisocyanate wherein both layers are in the cured state.
Claim 5
Dependent Claim
67 words
A two layer case bonding composite for double base propellants comprising: 1. a first layer comprising vinyl chloride-vinyl acetate copolymer, triphenylmethane triisocyanate and a lower dialkyl ester of a dicarboxylic acid, and 2. a second layer, bonded to said first layer comprising polyvinyl formal and a curing agent selected from the group consisting of titanium acetylacetonate and 2,4-tolylene diisocyanate wherein both layers are in the cured state.
Claim 6
Dependent Claim
23 words
A case bonding composite for double base propellants according to claim 3 wherein the dialkyl ester of a dicarboxylic acid is dibutyl sebacate.
Claim 7
Dependent Claim
41 words
A case bonding system for double base propellants as described in claim 3 wherein the vinyl chloride-vinyl acetate containing layer is attached to a material selected from the group consisting of fiberglass, cellulose acetate, styrene butadiene rubber elastomer and phenolic compositions.
Claim 8
Dependent Claim
39 words
A case bonding system for double base propellants as described in claim 4 wherein the vinyl chloride-vinyl acetate layer is attached to a material selected from the group consisting of fiberglass, cellulose acetate, styrene-butadiene rubber elastomer and phenolic compositions.
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) | 1979-06-01 | 1979-12-01 | 1980-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-01 | 1983-12-01 | 1984-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-01 | 1987-12-01 | 1988-06-01 | $7700.00 | Window Closed / Lapsed |