Patent US3676533A successfully refreshed from Google Patents.
US3676533A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing propellant charges from fibrous nitrocellulose
Assignee: Hercules LLC
•
Filing: 1968-06-26
•
Granted: 1972-07-11
•
Expires: 1988-06-26
Abstract
Abstract A process for preparing propellant charges from fibrous nitrocellulose is provided. The fibrous nitrocellulose is plasticized and then molded into a consolidated charge in which the fibers retain their individual identity. The propellant charges can be used as caseless cartridges for caseless ammunition.
Inventors
- 👤 Henry C Dehm
- 👤 Dale F Mellow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:40
CPC Classifications
C; C06; C06B; C06B21/00; C06B21/0008; C06B21/0016
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
12 words
The method of claim 1 wherein the plasticizer is comprised of nitroglycerin.
Claim 2
Dependent Claim
21 words
The method of claim 2 wherein the weight ratio of plasticizer to fibrous nitrocellulose is from about 1:9 to about 3:7.
Claim 3
Dependent Claim
11 words
The method of claim 3 wherein the plasticizer solvent is isopropanol.
Claim 4
Dependent Claim
12 words
The method of claim 3 wherein the plasticizer solvent is methylene chloride.
Claim 5
Independent Claim
130 words
The method of preparing a caseless cartridge from dynamite grade nitrocellulose, said method comprising: a. dissolving a plasticizer comPrised of nitroglycerin in a volatile solvent to form a plasticizing solution, said solvent being a non-solvent for nitrocellulose, b. admixing fibrous nitrocellulose with the plasticizing solution until the fibrous nitrocellulose fibers have absorbed the desired amount of plasticizer, c. removing the volatile solvent from the admixture, d. recovering plasticized fibrous nitrocellulose fibers substantially free of solvent, and e. molding the plasticized fibrous nitrocellulose at a temperature of from about 35* C. to about 50* C., at a pressure of about 12,000 psi to about 16,000 psi for about 1 second to about 10 seconds, and f. recovering a caseless cartridge in which the individual fibers of fibrous nitrocellulose retain their identity.
References Cited (Backward Citations)
US1862914A
Cited
US2344516A
Cited
US2235298A
Cited
US2988436A
Cited
US2946673A
Cited
US2991168A
Cited
US3422169A
Cited
US3092525A
Cited
US3378611A
Cited
US3290190A
Cited
US3398684A
Cited
US3447983A
Cited
US3463086A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |