US4627352A
Expired / Lapsed
US
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Single- or multiple-base powder charges for propellants and process for their manufacture
Assignee: Dynamit Nobel AG
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Filing: 1984-02-17
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Granted: 1986-12-09
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Expires: 2004-02-17
Abstract
Abstract A single- or multiple-base powder charge for propellants is made up of at least one powder grain in the form of a shaped mass of powder having at least one internal cavity. The diameters of the internal cavities within the powder grains making up the charge are different and at least a portion thereof is smaller than the critical diameter that corresponds to the ignition pressure and that governs the penetration of the ignition flame into the internal cavities. With this arrangement at least a portion of the internal cavities is ignited with a retardation only by gas pressures that rise above the ignition pressure.
Inventors
- 👤 Heinrich Brachert
- 👤 Dieter Girke
- 👤 Gerd Kellner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:38
CPC Classifications
F; F42; F42B; F42B5/00; F42B5/02; F42B5/16; C; C06; C06B; C06B21/00; C06B21/0091
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
124 words
A single- or multiple-base powder charge for propellants having at least one internal cavity formed therethrough, which comprises at least one powder grain in the form of a shaped mass of powder, the diameters of the internal cavities of the powder grains constituting said propellant charge being different and at least a portion thereof being smaller than the critical diameter pertaining to the ignition pressure and governing the penetration of the ignition flame into the internal cavities; and at least a portion of the internal cavities being ignited with a retardation only with gas pressures rising above the ignition pressure; at least the predominant portion of the internal cavities having diameters that are present in a predetermined distribution of from about 10 to 250μ.
Claim 2
Dependent Claim
124 words
A single- or multiple-base powder charge for propellants having at least one internal cavity formed therethrough, which comprises at least one powder grain in the form of a shaped mass of powder, the diameters of the internal cavities of the powder grains constituting said propellant charge being different and at least a portion thereof being smaller than the critical diameter pertaining to the ignition pressure and governing the penetration of the ignition flame into the internal cavities; and at least a portion of the internal cavities being ignited with a retardation only with gas pressures rising above the ignition pressure; at least the predominant portion of the internal cavities having diameters that are present in a predetermined distribution of from about 10 to 250μ.
Claim 3
Dependent Claim
32 words
A powder charge according to claim 1, wherein at least the predominant portion of the internal cavities have diameters that are present in a predetermined distribution of from about 50 to 150μ.
Claim 4
Dependent Claim
78 words
A powder charge according to claim 1, wherein with an increasing temperature, the deformability of the powder becomes easier and thereby a portion of the internal cavities becomes increasingly compressible under the effect of the gas pressure; and these compressed internal cavities are ignitable only upon still further increased gas pressures, in order to reduce or compensate for and/or overcompensate for the effect of the linear burning rate of the powder, which rate increases with a rising temperature.
Claim 5
Dependent Claim
43 words
A powder charge according to claim 1, said at least one grain having several internal cavities arranged in annular rows with alternating internal cavities with a smaller and with a larger diameter being arranged in succession from the outer surface of the grain.
Claim 6
Dependent Claim
33 words
A process for the production of a powder charge according to claim 1, characterized in that the powder charge is produced by the solvent method and is subjected to different degrees of shrinkage.
Claim 7
Dependent Claim
42 words
A process for the production of powder charge according to claim 4, characterized in that, during the piston-type extrusion or screw-type extrusion or the like of the powder grains, spikes of different thicknesses are utilized for the formation of the internal cavities.
Claim 8
Dependent Claim
27 words
A process for the production of a powder charge according to claim 4, characterized in that the internal cavities are formed subsequently in the molded powder charge.
Claim 9
Dependent Claim
33 words
A process for the production of a powder charge according to claim 4, characterized in that the powder grains are surface-treated at least once with at least one plasticizer for said powder grains.
Claim 10
Dependent Claim
157 words
A powder charge for propellants that exhibit ignition retardation due to the presence of a plurality of internal cavities of differnt diameters which comprises a plurality of powder grains, each powder grain being in the form of a shaped mass of powder having a uniform charge composition and having a plurality of internal cavities formed therethrough, the diameters of the internal cavities of each powder grain constituting said propellant charge being different and being microscopic in size; at least a portion of the internal cavities being smaller than the critical diameter pertaining to the ignition pressure and governing the penetration of the ignition flame into the internal cavities of said powder grain, said at least a portion of the internal cavities being ignited with a retardation only by gas pressure generated during burning that rise above the ignition; the critical diameter being from about 100 to 200μ and the ignition pressure ranging between 50 and 200 bars.
Claim 11
Dependent Claim
157 words
A powder charge for propellants that exhibit ignition retardation due to the presence of a plurality of internal cavities of differnt diameters which comprises a plurality of powder grains, each powder grain being in the form of a shaped mass of powder having a uniform charge composition and having a plurality of internal cavities formed therethrough, the diameters of the internal cavities of each powder grain constituting said propellant charge being different and being microscopic in size; at least a portion of the internal cavities being smaller than the critical diameter pertaining to the ignition pressure and governing the penetration of the ignition flame into the internal cavities of said powder grain, said at least a portion of the internal cavities being ignited with a retardation only by gas pressure generated during burning that rise above the ignition; the critical diameter being from about 100 to 200μ and the ignition pressure ranging between 50 and 200 bars.
Claim 12
Dependent Claim
31 words
A powder charge according to claim 9, wherein at least the predominant portion of the internal cavities have diameters that are present in a predetermined distribution of from 10 to 250μ.
Claim 13
Dependent Claim
32 words
A powder charge according to claim 9, wherein at least the predominant portion of the internal cavities have diameters that are present in a predetermined distribution of from about 50 to 150μ.
Claim 14
Dependent Claim
79 words
A powder charge according to claim 9, wherein with an increase in temperature, the formability of the powder grain becomes easier and thereby a portion of the internal cavities becomes increasingly compressible under the effect of the gas pressure and these compressed cavities are ignitable only upon still further increased gas pressures in order to reduce or compensate for and/or overcompensate for the effect of the linear burning rate of the powder, which rate increases with a rising temperature.
Claim 15
Dependent Claim
47 words
A powder charge according to claim 9, wherein each powder grain comprises a molded mass of powder having several internal cavities arranged in annular rows with alternating internal cavities having a smaller and a larger diameter being arranged in succession from the outer surface of the grain.
Claim 16
Dependent Claim
39 words
A process for the production of a powder charge according to claim 9, wherein the powder charge is produced by the solvent method and is subjected to different degrees of shrinkage in order to form the internal cavities therein.
Claim 17
Dependent Claim
43 words
A process for the production of a powder charge according to claim 13, wherein the molded mass of powder is obtained by extrusion and during extrusion, spikes of different thicknesses are arranged within the extrusion apparatus to effect formation of the internal cavities.
Claim 18
Dependent Claim
30 words
A process for the production of a powder charge according to claim 13, wherein the internal cavities are formed subsequently to the initial formation of the molded mass of powder.
Claim 19
Dependent Claim
31 words
A process for the production of a powder charge according to claim 13, wherein the powder grains are surface-treated at least once with at least one plasticizer for said powder grains.
Claim 20
Dependent Claim
34 words
A powder charge according to claim 9, wherein said powder charge is formed of an externally-uniform charge composition and said powder charge is free of external mechanical and chemical means for effecting ignition retardation.
Claim 21
Dependent Claim
142 words
A single- or multiple-base powder charge for propellants having at least one internal cavity formed therethrough, which comprises at least one powder grain in the form of a shaped mass of powder, the diameters of the internal cavities of the powder grains constituting said propellant charge being different and at least a portion thereof being smaller than the critical diameter pertaining to the ignition pressure and governing the penetration of the ignition flame into the internal cavities; and at least a portion of the internal cavities being ignited with a retardation only with gas pressures rising above the ignition pressure; the critical diameter being about 100 to 200μ and the ignition pressure ranging between 50 and 200 bars; and at least the predominant portion of the internal cavities having diameters that are present in a predetermined distribution of from 10 to 250μ.
Claim 22
Dependent Claim
142 words
A single- or multiple-base powder charge for propellants having at least one internal cavity formed therethrough, which comprises at least one powder grain in the form of a shaped mass of powder, the diameters of the internal cavities of the powder grains constituting said propellant charge being different and at least a portion thereof being smaller than the critical diameter pertaining to the ignition pressure and governing the penetration of the ignition flame into the internal cavities; and at least a portion of the internal cavities being ignited with a retardation only with gas pressures rising above the ignition pressure; the critical diameter being about 100 to 200μ and the ignition pressure ranging between 50 and 200 bars; and at least the predominant portion of the internal cavities having diameters that are present in a predetermined distribution of from 10 to 250μ.
References Cited (Backward Citations)
US540327A
Cited
FR1300941A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-12-08 | 1990-06-09 | 1990-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-08 | 1994-06-09 | 1994-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-08 | 1998-06-09 | 1998-12-09 | $7700.00 | Window Closed / Lapsed |