US3703868A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protective surface covering having heat and moisture resistant properties for caseless ammunition
Assignee: Hercules LLC
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Filing: 1970-07-07
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Granted: 1972-11-28
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Expires: 1990-07-07
Abstract
Abstract A heat and moisture resistant surface covering for propellant is provided. This surface covering is consumed in the chamber of a gun with the propellant charge being protected by the surface covering. The surface covering is prepared from a polyolefin film base material having a heat resistant and combustible composition bonded to the exterior surface of the base material. The surface covering of this invention has particular utility for use with caseless ammunition.
Inventors
- 👤 Edmund C Braak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:22
CPC Classifications
F; F42; F42B; F42B5/00; F42B5/02; F42B5/18; F42B5/192; F42B5/196
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
21 words
The heat and moisture resistant protective surface covering of claim 1 wherein the base material is polyethylene film or polypropylene film.
Claim 2
Dependent Claim
27 words
The heat and moisture resistant protective surface covering of claim 2 wherein the base material has a thickness of from about 0.5 mils to about 1.5 mils.
Claim 3
Dependent Claim
53 words
The heat and moisture resistant protective surface covering of claim 3 wherein the heat resistant and combustible coating composition is applied to the base material to a thickness of from about 2.5 to about 4.5 mils, the weight ratio of said coating to the base material being from about 5/1 to about 8/1
Claim 4
Dependent Claim
122 words
A heat and moisture resistant protective surface covering for propellant capable of being substantially consumed within the chamber of a gun with the propellant, said protective covering comprising a base material of polypropylene film having a thickness of from about 0.5 to 0.75 mils and having an activated exterior surface, and a heat resistant and combustible composition bonded to the activated exterior surface of the polypropylene film, said heat resistant and combustible composition comprising by weight from about 10 percent to about 30 percent of a crosslinked polyacrylic rubber binder consisting essentially of about 97 percent ethyl acrylate and about 3 percent of combined N-methylol acrylamide:methacrylamide in intimate admixture with from about 70 percent to about 90 percent of particulate cyclotetramethylenetetranitramine (HMX).
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) | 1975-11-28 | 1976-05-29 | 1976-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-28 | 1980-05-29 | 1980-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-28 | 1984-05-29 | 1984-11-28 | $7700.00 | Window Closed / Lapsed |