Patent US3927616A successfully refreshed from Google Patents.
US3927616A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combustible cartridge case
Assignee: United States Department of the Army
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Filing: 1974-04-23
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Granted: 1975-12-23
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Expires: 1994-04-23
Abstract
Abstract Porous combustible cartridge cases containing nitrocellulose, reinforcing fibers and a resinous binder, are rendered resistant to water and oil by providing the exterior surface with a consumable coating consisting essentially of RDX, HMX or PETN dispersed in a polymeric resin, e.g., an alkyl methacrylate, which is capable of thermally depolymerizing to the monomer.
Inventors
- 👤 Sydney Axelrod
- 👤 Walter Brenner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:31
CPC Classifications
F; F42; F42B; F42B5/00; F42B5/02; F42B5/18; F42B5/192; F42B5/196; C; C06; C06B; C06B45/00; C06B45/04; C06B45/06; C06B45/10; C06B45/12; Y; Y10; Y10S; Y10S102/00; Y10S102/70
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
75 words
A POROUS COMBUSTIBLE CATRIDGE CASE COMPRISING NITROCELLULOSE REINFORCING FIBERS AND A RESINOUS BINDER, WHEREIN AT LEAST THE EXTERIOR SURFACE OF THE CASE IS COVERED WITH A SUBSTANTIALLY WATER-IMPERMEABL, CONSUMABLE COATING CONSISTING ESSENTIALLY OF FINELY DIVIDED PARTICLES OF A SOLID HIGH ENERGY EXPLOSIVE OF THE GROUP CONSISTING OF CYCLOTRIMETHYLENETRINITRAMINE, CYCLOTETRAMETHYLENETETRANITRAMINE AND PENTRAERYTHRITOL TETRANITRATE, DISPERSED IN A THERMALLY DEPOLYMERIZABLE SOLID POLYMERIC RESIN OF THE GROUP CONSISTING OF ALKYL METHACRYKATE POLYMERIC, METHACRYLONITRILE POLYMERS AND ALPHA METHYL STYRENE POLYMERS.
Claim 2
Dependent Claim
75 words
A POROUS COMBUSTIBLE CATRIDGE CASE COMPRISING NITROCELLULOSE REINFORCING FIBERS AND A RESINOUS BINDER, WHEREIN AT LEAST THE EXTERIOR SURFACE OF THE CASE IS COVERED WITH A SUBSTANTIALLY WATER-IMPERMEABL, CONSUMABLE COATING CONSISTING ESSENTIALLY OF FINELY DIVIDED PARTICLES OF A SOLID HIGH ENERGY EXPLOSIVE OF THE GROUP CONSISTING OF CYCLOTRIMETHYLENETRINITRAMINE, CYCLOTETRAMETHYLENETETRANITRAMINE AND PENTRAERYTHRITOL TETRANITRATE, DISPERSED IN A THERMALLY DEPOLYMERIZABLE SOLID POLYMERIC RESIN OF THE GROUP CONSISTING OF ALKYL METHACRYKATE POLYMERIC, METHACRYLONITRILE POLYMERS AND ALPHA METHYL STYRENE POLYMERS.
Claim 3
Dependent Claim
33 words
A cartridge case according to claim 1, wherein the coating contains between 30 and 90 weight percent of the high energy explosive and between 70 and 10 weight percent of the polymeric resin.
Claim 4
Dependent Claim
15 words
A cartridge case according to claim 1, wherein the resin is an alkyl methacrylate polymer.
Claim 5
Dependent Claim
29 words
A cartridge case according to claim 3, wherein the alkyl methacrylate polymer is a methyl methacrylate polymer, an ethyl methacrylate polymer or a butyl methacrylate polymer and mixtures thereof.
Claim 6
Dependent Claim
36 words
A cartridge case according to claim 3, wherein the alkyl methacrylate polymer amounts to about 20 weight percent and the solid high energy explosive is cyclotrimethylenetrinitramine and amounts to about 80 weight percent of the coating.
References Cited (Backward Citations)
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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) | 1978-12-22 | 1979-06-23 | 1979-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-22 | 1983-06-23 | 1983-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-22 | 1987-06-23 | 1987-12-23 | $7700.00 | Window Closed / Lapsed |