US4094248A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High packing density propellant grains
Assignee: United States Department of the Army
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Filing: 1977-04-21
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Granted: 1978-06-13
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Expires: 1997-04-21
Abstract
Abstract A propellant charge is assembled by stacking together a plurality of extrd longitudinally grooved polygonally shaped high packing density propellant grains. An hexagonal configuration provides for nearly full utilization of the circular volume of a propellant chamber. Selective location of a plurality of perforations and grooves through each grain member is used to provide propellant charge assemblies having uniform web distribution and improved burn characteristics.
Inventors
- 👤 Sidney S. Jacobson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:04
CPC Classifications
F; F42; F42B; F42B5/00; F42B5/02; F42B5/16; F02; F02K; F02K9/00; F02K9/08; F02K9/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
95 words
A propellant charge which comprises: a plurality of extruded polygonally longitudinal shaped propellant grains, said grains having a plurality of equally spaced internal perforations longitudinally disposed therethrough, a plurality of longitudinally disposed external vertex grooves in parallel alignment with said internal perforations, and a plurality of semi-circular longitudinally disposed external grooves located at the midpoint of each polygonal side, said semi-circular grooves being in parallel alignment with said internal perforations and said external vertex grooves, said plurality of internal perforations vertex grooves, and said semi-circular grooves each being separated by a web of equal thickness.
Claim 2
Dependent Claim
95 words
A propellant charge which comprises: a plurality of extruded polygonally longitudinal shaped propellant grains, said grains having a plurality of equally spaced internal perforations longitudinally disposed therethrough, a plurality of longitudinally disposed external vertex grooves in parallel alignment with said internal perforations, and a plurality of semi-circular longitudinally disposed external grooves located at the midpoint of each polygonal side, said semi-circular grooves being in parallel alignment with said internal perforations and said external vertex grooves, said plurality of internal perforations vertex grooves, and said semi-circular grooves each being separated by a web of equal thickness.
Claim 3
Dependent Claim
71 words
A propellant charge as recited in claim 1 wherein said plurality of extruded polygonally longitudinal shaped propellant grains comprises a plurality of extruded hexagonally shaped propellant grains having a plurality of internal circular perforation being centered on the vertices of equilateral triangles formed by joining opposite vertices of a hexagon and by joining the mid-points of every other side of the hexagon cyclically in both clock wise and counter clockwise directions.
Claim 4
Dependent Claim
42 words
A propellant charge as recited in claim 2 wherein said plurality of extruded hexagonally shaped propellant grains comprises a plurality of longitudinally disposed external vertex grooves therein having 120° arc lengths of a circle equal to the radius of said internal perforations.
Claim 5
Dependent Claim
54 words
A propellant charge as recited in claim 2 wherein said plurality of extruded hexagonally shaped propellant grains comprises a plurality of semi-circular longitudinal disposed external grooves located at the midpoint of each hexagonal side, said semi-circular longitudinally disposed grooves having 180° arc lengths of a circle equal to the radius of said internal perforations.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-12 | 1981-12-12 | 1982-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-12 | 1985-12-12 | 1986-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-12 | 1989-12-12 | 1990-06-13 | $7700.00 | Window Closed / Lapsed |