US3987731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite protective coating for combustible cartridge cases
Assignee: United States Department of the Army
•
Filing: 1976-01-16
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Granted: 1976-10-26
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Expires: 1996-01-16
Abstract
Abstract Porous combustible cartridge cases containing nitrocellulose, reinforcing bers and a resinous binder, are rendered resistant to water and oil by coating the surface with a composite coating containing an undercoating of polyvinyl alcohol and a top coating of a copolymer of vinylidene chloride and acrylonitrile.
Inventors
- 👤 John Brzuskiewicz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:32
CPC Classifications
F; F42; F42B; F42B5/00; F42B5/02; F42B5/025; F42B5/18; F42B5/192; F42B5/196; Y; Y10; Y10S; Y10S102/00; Y10S102/70
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
50 words
A porous combustible cartridge case comprising nitrocellulose, reinforcing fibers and a resinous binder, wherein at least the exterior surface of the case is covered with a composite protective coating comprising an undercoating consisting essentially of a polyvinyl alcohol resin and a topcoating consisting essentially of a vinylidene chloride-acrylonitrile copolymer resin.
Claim 2
Dependent Claim
50 words
A porous combustible cartridge case comprising nitrocellulose, reinforcing fibers and a resinous binder, wherein at least the exterior surface of the case is covered with a composite protective coating comprising an undercoating consisting essentially of a polyvinyl alcohol resin and a topcoating consisting essentially of a vinylidene chloride-acrylonitrile copolymer resin.
Claim 3
Dependent Claim
26 words
The cartridge case according to claim 1, wherein the polyvinyl alcohol resin undercoating amounts to between about 0.1 and 1% by weight of the cartridge case.
Claim 4
Dependent Claim
27 words
The cartridge case according to claim 1, wherein the vinylidene chloride-acrylonitrile copolymer resin topcoating amounts to between about 1 and 5% by weight of the cartridge case.
Claim 5
Dependent Claim
19 words
The cartridge case according to claim 1, wherein the vinylidene chloride-acrylonitrile copolymer resin coating contains a leafing aluminum pigment.
References Cited (Backward Citations)
US3727512A
Cited
US3730094A
Cited
US3703868A
Cited
US3769873A
Cited
US3927616A
Cited
US3954063A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-10-26 | 1980-04-26 | 1980-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-26 | 1984-04-26 | 1984-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-26 | 1988-04-26 | 1988-10-26 | $7700.00 | Window Closed / Lapsed |