US3706280A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Novel combustible cartridge case and process therefor
Assignee: United States Department of the Army
•
Filing: 1970-12-29
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Granted: 1972-12-19
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Expires: 1990-12-29
Abstract
Abstract Novel combustible cartridge cases of superior properties are obtained by impregnating a dry felted preform, produced from a mixture consisting essentially of a fibrous cellulosic material containing free hydroxyl groups and a highly combustible organic nitro compound in finely divided form, with an organic polyisocyanate or other water insoluble resin precursor capable of reacting with the cellulosic hydroxyl groups, and thereafter forming the water-insoluble resin in situ.
Inventors
- 👤 Jack Bobinski
- 👤 Jean P Picard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:56
CPC Classifications
F; F42; F42B; F42B5/00; F42B5/02; F42B5/18; F42B5/188; Y; Y10; Y10S; Y10S102/00; Y10S102/70
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
27 words
A mixture according to claim 1 wherein the water-insoluble resin formed amounts to from about 10 percent to about 50 percent by weight of the cartridge case.
Claim 2
Dependent Claim
14 words
A method according to claim 1 wherein the organic polyisocyanate is a polymethylene polyphenylisocyanate.
Claim 3
Dependent Claim
34 words
A method according to claim 1 wherein the organic polyisocyanate is employed in mixture with an organic polyol, the ratio of NCO groups to polyol hydroxyl groups being greater than about 1.5 to 1.
Claim 4
Dependent Claim
37 words
A method according to claim 1 wherein the fibrous cellulosic material is cellulose and the highly combustible organic nitro compound is nitrocellulose, the amount of nitro cellulose being at least equal to the weight of said cellulose.
Claim 5
Dependent Claim
31 words
A method according to claim 1 wherein the dried felted preform contains from about 10 percent to about 50 percent of pentaerythritol tetranitrate and the remainder consists essentially of nitrocellulose fibers.
Claim 6
Dependent Claim
31 words
A method according to claim 1 wherein the dried felted preform contains from about 50 percent to about 70 percent of pentaerythritol tetranitrate and the remainder consists essentially of cellulose fibers.
Claim 7
Dependent Claim
9 words
The product obtained by the method of claim 1.
Claim 8
Dependent Claim
9 words
The product obtained by the method of claim 2.
Claim 9
Dependent Claim
9 words
The product obtained by the method of claim 3.
Claim 10
Dependent Claim
9 words
The product obtained by the method of claim 5.
Claim 11
Dependent Claim
9 words
The product obtained by the method of claim 6.
Claim 12
Dependent Claim
9 words
The product obtained by the method of claim 9.
Claim 13
Dependent Claim
13 words
A method according to claim 4, wherein the organic polyol is diethylene glycol.
Claim 14
Dependent Claim
9 words
The product obtained by the method of claim 15.
Claim 15
Dependent Claim
9 words
The product obtained by the method of claim 4.
References Cited (Backward Citations)
US3102833A
Cited
US3264993A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-19 | 1976-06-19 | 1976-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-19 | 1980-06-19 | 1980-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-19 | 1984-06-19 | 1984-12-19 | $7700.00 | Window Closed / Lapsed |