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US5174837A Expired / Lapsed US ⏱️ 0.0 years remaining

Temperature-resistant, fragmentable propellent charges

Assignee: Eurenco France SA
•
Filing: 1991-11-06
•
Granted: 1992-12-29
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Expires: 2011-11-06
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Abstract

Abstract The present invention relates to the field of propellent charges for small and medium calibre arms. The invention relates to a process for the manufacture of fragmentable propellent charges, which consists in a first stage in coating powder particles with a mixture of dinitropolystyrene and of a compound of the polyvinyl nitrate and/or polyvinyl acetate type and, in a second stage, in compressing at between 100 DEG C. and 140 DEG C. the powder particles thus obtained. The invention also relates to the fragmentable charges obtained by the process and to the coated particulate powders obtained at the end of the first stage of the process. The fragmentable charges according to the invention exhibit a temperature behaviour which is superior to that of traditional fragmentable charges and are suitable for cartridgeless ammunition intended for arms with a high rate of fire.

Inventors

  • 👤 Jacques Boileau
  • 👤 Louis Leneveu

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-05 10:55
CPC Classifications
C; C06; C06B; C06B45/00; C06B45/18; C06B21/00; C06B21/0033; C06B21/0041; C06B21/0083; C06B45/02

Claims Analysis

Total Claims: 9
Claim 1
Independent Claim 55 words
A fragmentable charge of compressed particulate propellant powder containing nitrocellulose, the particles of which were coated prior to compression with a film of a mixture of a dinitropolystyrene, a stabilizer and a polyvinyl alcohol derivative which is polyvinyl nitrate, polyvinyl acetate or mixture thereof or a mixture of said polyvinyl alcohol derivative and cellulose acetate.
Claim 2
Dependent Claim 55 words
A fragmentable charge of compressed particulate propellant powder containing nitrocellulose, the particles of which were coated prior to compression with a film of a mixture of a dinitropolystyrene, a stabilizer and a polyvinyl alcohol derivative which is polyvinyl nitrate, polyvinyl acetate or mixture thereof or a mixture of said polyvinyl alcohol derivative and cellulose acetate.
Claim 3
Dependent Claim 22 words
The charge according to claim 1 wherein the weight ratio of dinitropolystyrene and said polyvinyl alcohol derivative is between 25% and 75%.
Claim 4
Dependent Claim 26 words
The charge according to claim 1 wherein the propellant powder is a nitrocellulose single base powder, a composite powder, a double base or a multibase powder.
Claim 5
Dependent Claim 45 words
The charge according to claim 1 wherein in said mixture of cellulose acetate and said polyvinyl alcohol derivative the amount of said polyvinyl alcohol derivative is at least one third by weight of the total weight of said polyvinyl alcohol derivative and said cellulose acetate.
Claim 6
Dependent Claim 15 words
The charge according to claim 1 wherein said dinitropolystyrene has a nitrogen content of 14.81%.
Claim 7
Dependent Claim 42 words
A propellant powder containing nitrocellulose having particles coated with a film of a mixture containing a dinitropolystyrene, a stabilizer and a polyvinyl alcohol derivative which is a member selected from the group consisting of polyvinyl nitrate, a polyvinyl acetate and mixtures thereof.
Claim 8
Dependent Claim 42 words
A propellant powder containing nitrocellulose having particles coated with a film of a mixture containing a dinitropolystyrene, a stabilizer and a polyvinyl alcohol derivative which is a member selected from the group consisting of polyvinyl nitrate, a polyvinyl acetate and mixtures thereof.
Claim 9
Dependent Claim 13 words
The powder according to claim 6 which is a nitrocellulose single base powder.

References Cited (Backward Citations)

US3154448A Cited
US3679781A Cited
US4023996A Cited
US4279672A Cited
US4326901A Cited
US4365558A Cited
US4347087A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1995-12-29 1996-06-29 1996-12-29 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1999-12-29 2000-06-29 2000-12-29 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2003-12-29 2004-06-29 2004-12-29 $7700.00 Window Closed / Lapsed

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