US4478128A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Projectile carrier for liquid propellant gun
Assignee: United States Department of the Navy
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Filing: 1981-05-11
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Granted: 1984-10-23
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Expires: 2001-05-11
Abstract
Abstract This invention concerns an improved round for use in liquid propellant gu The improved round comprises a projectile attached to a carrier which is shaped like an abbreviated cartridge case. The carrier has a plurality of injection ports that communicate to an expandable volume. Sealing means prevent the escape of liquid propellant from the expandable volume which upon injection causes the projectile to be pumped to a forcing cone leaving the carrier behind. Several ignition means are used employing Boxer, Berdan or electric primers.
Inventors
- 👤 William L. Black
- 👤 Kenneth L. Moore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:22
CPC Classifications
F; F42; F42B; F42B5/00; F42B5/02; F42B5/16; F41; F41A; F41A1/00; F41A1/04; F42B14/00; F42B14/02
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
148 words
An improved round for use in a liquid propellant gun comprising: a projectile; and an abbreviated carrier including a body having an open front end dimensioned to provide frictional engagement with said projectile for receiving said projectile and a rear end; a plurality of injection ports located about a circumference, said ports communicating to an expandable volume between said body rear end and said projectile; sealing means for preventing the escape of propellant to a breech, located between said injection ports and said rear end of said body; an extractor groove located proximally to said rear end between said sealing means and said rear end; a primer cavity located in said rear end of said body; a primer flash hole formed in said body, located between said primer cavity and said expandable volume for communicating therebetween; and ignition means for igniting liquid propellant located within said primer cavity.
Claim 2
Dependent Claim
148 words
An improved round for use in a liquid propellant gun comprising: a projectile; and an abbreviated carrier including a body having an open front end dimensioned to provide frictional engagement with said projectile for receiving said projectile and a rear end; a plurality of injection ports located about a circumference, said ports communicating to an expandable volume between said body rear end and said projectile; sealing means for preventing the escape of propellant to a breech, located between said injection ports and said rear end of said body; an extractor groove located proximally to said rear end between said sealing means and said rear end; a primer cavity located in said rear end of said body; a primer flash hole formed in said body, located between said primer cavity and said expandable volume for communicating therebetween; and ignition means for igniting liquid propellant located within said primer cavity.
Claim 3
Dependent Claim
29 words
An improved round according to claim 1, wherein said plurality of injection ports of said carrier are circular holes formed in said body, located about circumferences of said carrier.
Claim 4
Dependent Claim
22 words
An improved round according to claim 1, wherein said projectile has elastomer seal to prevent escape of liquid propellant into a barrel.
Claim 5
Dependent Claim
42 words
An improved round according to claim 3, wherein said projectile has a rotating band into which said elastomer seal is attached, said band being made of malleable material so as to adapt to riflings in a barrel upon ignition of said round.
Claim 6
Dependent Claim
20 words
An improved round according to claim 1, wherein said ignition means of said carrier comprises a primer and sealing means.
Claim 7
Dependent Claim
23 words
An improved round according to claim 5, wherein said primer is selected from the group consisting of standard Boxer, Berdan, or electric primers.
Claim 8
Dependent Claim
43 words
An improved round according to claim 5, wherein said sealing means is a metal disk with an elastomer coating on a side, securely positioned in a bottom of said primer cavity of said carrier, with the elastomer coating facing away from said primer.
Claim 9
Dependent Claim
34 words
An improved round according to claim 5, wherein said sealing means includes at least one rupturable membrane blocking said primer flash hole, said membranes located in said primer flash holes nearest said expandable volume.
Claim 10
Dependent Claim
22 words
An improved round according to claim 5 wherein said sealing means are elastomer plugs having caps secured in said primer flash holes.
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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) | 1987-10-23 | 1988-04-23 | 1988-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-23 | 1992-04-23 | 1992-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-23 | 1996-04-23 | 1996-10-23 | $7700.00 | Window Closed / Lapsed |