US4004523A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solid propellant charges
Assignee: Individual
•
Filing: 1966-10-26
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Granted: 1977-01-25
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Expires: 1986-10-26
Abstract
Abstract A solid propellant charge having combustion inhibited surfaces provided by bonding elastomeric combustion-inhibiting material to the surfaces by a layer of a polyvinyl acetal resin bonded directly to those surfaces, and by a layer of another resin selected from epoxy resins, polyesters and formaldehyde resins.
Inventors
- 👤 David Victor Clifford
- 👤 Stephen William Bell
- 👤 Stuart Gordon
- 👤 Philip Graham Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:26
CPC Classifications
C; C06; C06B; C06B45/00; C06B45/12; C06B21/00; C06B21/0083; F; F02; F02K; F02K9/00; F02K9/08; F02K9/24
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
118 words
A combustion-inhibited solid propellant charge comprising: a solid mass of double-base propellant comprising a mixture of nitrocellulose and a liquid nitric ester, the solid mass of double-base propellant having at least one surface at which combustion is to be inhibited; a layer of a polyvinyl acetal resin bonded directly to said surface; an elastomeric combustion-inhibiting material bonded to the layer of polyvinyl acetal resin; and a layer of another resin which is compatible with the polyvinyl acetal resin and with the elastomeric combustion-inhibiting material, said other layer being selected from the group of resins consisting of epoxy resins, polyesters and formaldehyde resins and being bonded between the layer of a polyvinyl acetal resin and the elastomeric combustion-inhibiting material.
Claim 2
Dependent Claim
118 words
A combustion-inhibited solid propellant charge comprising: a solid mass of double-base propellant comprising a mixture of nitrocellulose and a liquid nitric ester, the solid mass of double-base propellant having at least one surface at which combustion is to be inhibited; a layer of a polyvinyl acetal resin bonded directly to said surface; an elastomeric combustion-inhibiting material bonded to the layer of polyvinyl acetal resin; and a layer of another resin which is compatible with the polyvinyl acetal resin and with the elastomeric combustion-inhibiting material, said other layer being selected from the group of resins consisting of epoxy resins, polyesters and formaldehyde resins and being bonded between the layer of a polyvinyl acetal resin and the elastomeric combustion-inhibiting material.
Claim 3
Dependent Claim
16 words
A solid propellant charge according to claim 1 wherein the polyvinyl acetal resin is polyvinyl formal.
Claim 4
Dependent Claim
39 words
A solid propellant charge according to claim 1 wherein the elastomeric combusion-inhibiting material is selected from the group of elastomers consisting of a modified chlorinated sulphonated polyethylene, a modified ethylene-propylene terpolmer, a castable epoxide and a castable polyurethane rubber.
Claim 5
Dependent Claim
24 words
A solid propellant charge according to claim 3 wherein said another resin is phenol-formaldehyde resin and is bonded directly to the elastomeric combustion-inhibiting material.
Claim 6
Dependent Claim
104 words
A combustion inhibited solid propellant charge comprising a solid mass of double-base propellant comprising a mixture of nitro-cellulose and a liquid nitric ester, the solid mass of double-base propellant having at least one surface at which combustion is to be inhibited, a layer of polyvinyl formal bonded directly to said surface, an elastomeric combustion-inhibiting material selected from the group of elastomers consisting of a modified chlorinated sulphonated polyethylene, a modified ethylene-propylene terpolymer, a castable epoxide, and a castable polyurethane rubber bonded to the layer of polyvinyl formal, and a layer of phenol-formaldehyde bonded between the layer of polyvinyl formal and the elastomeric combustion-inhibiting material.
Claim 7
Dependent Claim
104 words
A combustion inhibited solid propellant charge comprising a solid mass of double-base propellant comprising a mixture of nitro-cellulose and a liquid nitric ester, the solid mass of double-base propellant having at least one surface at which combustion is to be inhibited, a layer of polyvinyl formal bonded directly to said surface, an elastomeric combustion-inhibiting material selected from the group of elastomers consisting of a modified chlorinated sulphonated polyethylene, a modified ethylene-propylene terpolymer, a castable epoxide, and a castable polyurethane rubber bonded to the layer of polyvinyl formal, and a layer of phenol-formaldehyde bonded between the layer of polyvinyl formal and the elastomeric combustion-inhibiting material.
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) | 1980-01-25 | 1980-07-26 | 1981-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-25 | 1984-07-26 | 1985-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-25 | 1988-07-26 | 1989-01-25 | $7700.00 | Window Closed / Lapsed |