US4395934A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wear reducer
Assignee: United States Department of the Army
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Filing: 1982-03-10
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Granted: 1983-08-02
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Expires: 2002-03-10
Abstract
Abstract An improved ammunition propellant composition and method for reducing gun member wear, erosion, flash and cook-off through use of an additive comprising a mixture of a super water absorbent starch modified polyacrylonitrile which has been subjected to alkaline saponification and water. The wear reducing additive is preferably formed into sheets which can be used with propellants selected from the group consisting of bagged propelling charges and cartridge cased propellants.
Inventors
- 👤 Sydney Axelrod
- 👤 Walter Brenner
- 👤 Barry A. Rugg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:03
CPC Classifications
F; F42; F42B; F42B5/00; F42B5/02; F42B5/24; C; C06; C06B; C06B23/00; C06B23/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
83 words
A method for reducing gun member thermal erosion and wear through use of coolant additive with a propellant charge for reducing propellant flame temperature comprising the steps of preparing a sheet comprising a highly water adsorbent starch-acrylonitrile copolymer which has been subjected to alkaline saponification and a major amount of absorbed water; and disposing said sheet around the ammunition propellant charge to reduce erosion by formation of a laminar cooling layer of gas adjacent to the gun member upon firing of said charge.
Claim 2
Independent Claim
83 words
A method for reducing gun member thermal erosion and wear through use of coolant additive with a propellant charge for reducing propellant flame temperature comprising the steps of preparing a sheet comprising a highly water adsorbent starch-acrylonitrile copolymer which has been subjected to alkaline saponification and a major amount of absorbed water; and disposing said sheet around the ammunition propellant charge to reduce erosion by formation of a laminar cooling layer of gas adjacent to the gun member upon firing of said charge.
Claim 3
Dependent Claim
25 words
The method of claim 1 wherein the water absorbed within said sheet contains ethylene glycol antifreeze to prevent freezing of the water at low temperature.
Claim 4
Dependent Claim
21 words
The method of claim 1 wherein the coolant additive sheet is disposed around said propellant charge within a conventional cartridge case.
Claim 5
Dependent Claim
21 words
The method of claim 1 wherein the coolant additive sheet is disposed around said propellant charge within a propellant bagged charge.
Claim 6
Dependent Claim
24 words
The method of claim 1 wherein the additive sheet consists essentially of no more than 10% by weight copolymer and the balance absorbed water.
References Cited (Backward Citations)
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Cited
US671708A
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US3209689A
Cited
US3282215A
Cited
US3392670A
Cited
US3403626A
Cited
US3935099A
Cited
US4045387A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-08-01 | 1987-01-31 | 1987-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-01 | 1991-01-31 | 1991-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-01 | 1995-01-31 | 1995-08-02 | $7700.00 | Window Closed / Lapsed |