Patent US6004040A successfully refreshed from Google Patents.
Patent US4126955A successfully refreshed from Google Patents.
US4126955A
Expired / Lapsed
US
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High velocity tapered bore gun and ammunition
Assignee: United States Department of the Army
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Filing: 1977-03-17
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Granted: 1978-11-28
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Expires: 1997-03-17
Abstract
Abstract A high velocity gun and ammunition wherein the projectile is encased in a formable material which is squeezed in the tapered bore of the gun to more efficiently utilize expansion gases for accelerating the projectile.
Inventors
- 👤 George G. Coffield, Jr.
- 👤 Dennis L. Beug
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:17
CPC Classifications
F; F42; F42B; F42B14/00; F42B14/06; F42B14/064; F41; F41A; F41A21/00; F41A21/16; F42B14/068
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
190 words
A high velocity tapered bore gun and ammunition consisting of: a gun having a barrel with a chamber at one end and a muzzle section at the other, said chamber having a bore of relatively larger diameter, said muzzle section having a bore relatively smaller diameter, said gun having a tapered bore extending between said ends, an ammunition package adapted to fit into said chamber, said package having a projectile of a diameter sufficient to pass through said muzzle section without deformation, said projectile being encased in a deformable material of a diameter sufficient to fit into said chamber without deformation, propellant means rearwardly of said deformable material which, when ignited, will expand and thus propel deformable material through said gun barrel, said tapered bore reducing the diameter of said deformable material to the muzzle diameter for ejection following ejection of said projectile, said deformable material increasing in length as it reduces in diameter to maintain its original volume, said deformable material imparting additional energy and acceleration to said projectile as said deformable material elongates, said projectile having a greater velocity than that of said deformable material and said propellant.
Claim 2
Dependent Claim
190 words
A high velocity tapered bore gun and ammunition consisting of: a gun having a barrel with a chamber at one end and a muzzle section at the other, said chamber having a bore of relatively larger diameter, said muzzle section having a bore relatively smaller diameter, said gun having a tapered bore extending between said ends, an ammunition package adapted to fit into said chamber, said package having a projectile of a diameter sufficient to pass through said muzzle section without deformation, said projectile being encased in a deformable material of a diameter sufficient to fit into said chamber without deformation, propellant means rearwardly of said deformable material which, when ignited, will expand and thus propel deformable material through said gun barrel, said tapered bore reducing the diameter of said deformable material to the muzzle diameter for ejection following ejection of said projectile, said deformable material increasing in length as it reduces in diameter to maintain its original volume, said deformable material imparting additional energy and acceleration to said projectile as said deformable material elongates, said projectile having a greater velocity than that of said deformable material and said propellant.
Claim 3
Dependent Claim
33 words
A high velocity tapered bore gun and ammunition as in claim 1 wherein said gun barrel has a uniform diameter muzzle section, a rear section of uniform diameter, said tapered bore extending therebetween.
Claim 4
Dependent Claim
18 words
A high velocity tapered bore gun and ammunition as in claim 2 wherein said rear section is rifled.
Claim 5
Dependent Claim
33 words
A high velocity tapered bore gun and ammunition as in claim 1 wherein said propellant means, while burning, follows said deformable material and is itself deformed as it passes through said tapered bore.
Claim 6
Dependent Claim
24 words
A high velocity tapered bore gun and ammunition as in claim 4 wherein said ammunition package includes a cartridge casing having a primer therein.
Claim 7
Dependent Claim
24 words
A high velocity tapered bore gun and ammunition as in claim 1 wherein said ammunition package includes a cartridge casing having a primer therein.
References Cited (Backward Citations)
GB521388A
Cited
US3011404A
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US3450050A
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US3412681A
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US3400661A
Cited
US3527137A
Cited
US3680485A
Cited
US3948184A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-11-27 | 1982-05-29 | 1982-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-27 | 1986-05-29 | 1986-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-27 | 1990-05-29 | 1990-11-28 | $7700.00 | Window Closed / Lapsed |