US4326901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fragmentable charges of propelland powder coated with polyvinyl nitrate, and the process for their manufacture
Assignee: Societe Nationale des Poudres et Explosifs
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Filing: 1979-09-05
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Granted: 1982-04-27
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Expires: 1999-09-05
Abstract
Abstract The present invention relates to a new type of fragmentable charge for weapons of small and medium caliber. The process for the manufacture of fragmentable charges of propellant powder containing nitrocellulose, according to the invention, is characterized in that, in a conventional process for the manufacture of propellant powder containing nitrocellulose, with solvent, a glazing operation is carried out, in which a glazing solution containing at least polyvinyl nitrate and a stabilizer is sprayed onto the grains of powder, and in that, after evaporation of the solvent from the said solution, the grains of powder thus obtained are compressed at between about 80 DEG and 120 DEG . The invention also relates to the fragmentable charges obtained by means of this process.
Inventors
- 👤 Louis Leneveu
- 👤 Didier Treneules
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:41
CPC Classifications
C; C06; C06B; C06B45/00; C06B45/04; C06B45/06; C06B45/10; C06B45/105; C06B45/18; C06B45/20; C06B45/28
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
101 words
Process for the manufacture of fragmentable charges from grains of propellant powder containing nitrocellulose comprising (1) malaxating nitrocellulose in a first solvent which has a gelatinizing action for nitrocellulose thus obtaining a paste, (2) extruding the paste to obtain strands, (3) chopping the strands to obtain grains, (4) drying the grains, (5) spraying the grains with a glazing solution containing at least polyvinyl nitrate, a second solvent, and a stabiliser to obtain grains coated with polyvinyl nitrate, (6) evaporating the second solvent and (7) compressing the resulting grains at a temperature of 80° to 120° C. to form said fragmentable charges.
Claim 2
Dependent Claim
101 words
Process for the manufacture of fragmentable charges from grains of propellant powder containing nitrocellulose comprising (1) malaxating nitrocellulose in a first solvent which has a gelatinizing action for nitrocellulose thus obtaining a paste, (2) extruding the paste to obtain strands, (3) chopping the strands to obtain grains, (4) drying the grains, (5) spraying the grains with a glazing solution containing at least polyvinyl nitrate, a second solvent, and a stabiliser to obtain grains coated with polyvinyl nitrate, (6) evaporating the second solvent and (7) compressing the resulting grains at a temperature of 80° to 120° C. to form said fragmentable charges.
Claim 3
Dependent Claim
13 words
Process according to claim 1, wherein the second solvent is a ketone/alcohol mixture.
Claim 4
Dependent Claim
13 words
Process according to claim 1, wherein the second solvent is an ester/alcohol mixture.
Claim 5
Dependent Claim
15 words
Process according to claim 2, wherein the said ketone/alcohol mixture is an acetone/ethyl alcohol mixture.
Claim 6
Dependent Claim
16 words
Process according to claim 3, wherein, the said ester/alcohol mixture is an ethyl acetate/ethyl alcohol mixture.
Claim 7
Dependent Claim
13 words
Process according to claim 1, wherein the said glazing solution contains a plasticiser.
Claim 8
Dependent Claim
12 words
Process according to claim 1, wherein the said glazing solution contains nitrocellulose.
Claim 9
Dependent Claim
28 words
Process according to claim 1, wherein the amount of polyvinyl nitrate in the glazing solution is between 2 and 10% by weight of the powder to be treated.
Claim 10
Dependent Claim
24 words
Process according to claim 8, wherein the amount of polyvinyl nitrate is between 3 and 5% by weight of the powder to be treated.
Claim 11
Dependent Claim
20 words
Process according to claim 1, wherein said compressing is carried out at a pressure of between 100 and 200 bars.
Claim 12
Dependent Claim
24 words
The process according to claim 1 wherein said spraying with a glazing solution is carried out at a temperature of 30° to 50° C.
Claim 13
Dependent Claim
19 words
The process according to claim 1 wherein said first solvent is a mixture of an ether and ethyl alcohol.
Claim 14
Dependent Claim
98 words
Fragmentable charges based on grains of propellant powder containing nitrocellulose, prepared by (1) malaxating nitrocellulose in a first solvent which has a gelatinizing action for nitrocellulose thus obtaining a paste, (2) extruding the paste to obtain strands, (3) chopping the strands to obtain grains, (4) drying the grains, (5) spraying the grains with a glazing solution containing at least polyvinyl nitrate, a second solvent and a stabilizer to obtain grains coated with polyvinyl nitrate, (6) evaporating the second solvent and (7) compressing the resulting grains at a temperature of 80° to 120° C. to form said fragmentable charges.
Claim 15
Dependent Claim
98 words
Fragmentable charges based on grains of propellant powder containing nitrocellulose, prepared by (1) malaxating nitrocellulose in a first solvent which has a gelatinizing action for nitrocellulose thus obtaining a paste, (2) extruding the paste to obtain strands, (3) chopping the strands to obtain grains, (4) drying the grains, (5) spraying the grains with a glazing solution containing at least polyvinyl nitrate, a second solvent and a stabilizer to obtain grains coated with polyvinyl nitrate, (6) evaporating the second solvent and (7) compressing the resulting grains at a temperature of 80° to 120° C. to form said fragmentable charges.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-04-26 | 1985-10-26 | 1986-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-04-26 | 1989-10-26 | 1990-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-04-26 | 1993-10-26 | 1994-04-27 | $7700.00 | Window Closed / Lapsed |