Patent US3769873A successfully refreshed from Google Patents.
US3769873A
Expired / Lapsed
US
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Process for uniformly depositing resin in combustible cartridge cases
Assignee: United States Department of the Army
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Filing: 1972-01-25
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Granted: 1973-11-06
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Expires: 1992-01-25
Abstract
Abstract A process to control resin migration in combustible cartridge cases composed of nitrocellulose fibers and cellulose fibers is provided by adding to the conventional method the step of dipping the already formed and resin impregnated case into a liquid which is miscible with the solvent used to impregnate the resin into the felted cartridge case, but which is a non-solvent for the resin thereby precipitating the resin in situ and subsequently completing the formation of the case by drying.
Inventors
- 👤 W Abel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:39
CPC Classifications
F; F42; F42B; F42B5/00; F42B5/02; F42B5/18; F42B5/188; Y; Y10; Y10S; Y10S102/00; Y10S102/70; Y10T; Y10T442/00; Y10T442/20; Y10T442/2033
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
23 words
The method of claim 1, wherein the resin is deposited in amount between about 10% and 25% by weight of the cartridge case.
Claim 2
Dependent Claim
22 words
The method of claim 1, wherein the resin is selected from the group consisting of polyvinyl-formal resin, acrylic resin and phenolic resin.
Claim 3
Dependent Claim
15 words
The method of claim 1, wherein the liquid employed to precipate the resin is water.
Claim 4
Dependent Claim
23 words
The method of claim 4, wherein the resin is polyvinyl-formal and the organic solvent therefor is a mixture of toluene and ethyl alcohol.
Claim 5
Dependent Claim
66 words
A felted article for use as a combustible cartridge case, consisting essentially of a resin bonded, felted fibrous matte of combustible fibers consisting essentially of a mixture of between about 65% and 90% nitrocellulose fibers and between about 35% and 10% cellulose fibers, wherein said resin is a water-insoluble, non-elastomeric organic resin distributed essentially uniformly throughout said matte and is not chemically bonded to said fibers.
Claim 6
Dependent Claim
37 words
The felted article of claim 6, wherein the resin is selected from the group consisting of polyvinyl-formal resin, acrylic resin and phenolic resin present in amount between about 10 and 25 percent by weight of the case.
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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |