Patent US3808943A successfully refreshed from Google Patents.
US3808943A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gun-leveling device
Assignee: Individual
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Filing: 1972-04-27
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Granted: 1974-05-07
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Expires: 1992-04-27
Abstract
Abstract A handgun and rifle barrel device; said barrel comprising a cylinder with a bore with trapezoidal slots in predetermined positions and of predetermined proportions so that a torque reaction is induced at the discharge end of a gun barrel to prevent ''muzzle jump,'' together with an induced anti-recoil action and reduction of noise and blowback of hot gases.
Inventors
- 👤 L Kelly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:08
CPC Classifications
F; F41; F41A; F41A21/00; F41A21/28; F41A21/32; F41A21/36
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
180 words
An apparatus for reducing muzzle jump of a firearm having a barrel section defining a substantially uniform diameter bore through which a projectile travels under the influence of an explosive material, said apparatus comprising at least two passages formed directly within the firearm barrel section and communicating the bore with the outer periphery of the firearm barrel and adapted to vent to the atmosphere at least a portion of the gases produced by the explosive material upon firing of the firearm, said passages being non-mechanically formed in the barrel and arranged one on each side of an imaginary vertical plane extending longitudinally of the barrel and lying along the axis of the bore, said passages further being arranged above an imaginary horizontal plane extending longitudinally of the barrel and lying along said axis of the bore, said passages being of substantially uniform cross-sectional size and shape and terminating at their inner ends in an unburred and non-counterbored portion of the firearm bore so as to permit said gas venting without in any way reducing the ballistic characteristics of the firearm.
Claim 2
Independent Claim
180 words
An apparatus for reducing muzzle jump of a firearm having a barrel section defining a substantially uniform diameter bore through which a projectile travels under the influence of an explosive material, said apparatus comprising at least two passages formed directly within the firearm barrel section and communicating the bore with the outer periphery of the firearm barrel and adapted to vent to the atmosphere at least a portion of the gases produced by the explosive material upon firing of the firearm, said passages being non-mechanically formed in the barrel and arranged one on each side of an imaginary vertical plane extending longitudinally of the barrel and lying along the axis of the bore, said passages further being arranged above an imaginary horizontal plane extending longitudinally of the barrel and lying along said axis of the bore, said passages being of substantially uniform cross-sectional size and shape and terminating at their inner ends in an unburred and non-counterbored portion of the firearm bore so as to permit said gas venting without in any way reducing the ballistic characteristics of the firearm.
Claim 3
Dependent Claim
17 words
The invention as set forth in claim 1 wherein said passages are of a generally trapezoidal shape.
Claim 4
Dependent Claim
22 words
The invention as set forth in claim 1 wherein said passages are oriented at approximately 30* angles from said imaginary vertical plane.
Claim 5
Dependent Claim
26 words
The invention as set forth in claim 1 wherein the total cross-sectional area of said passages is approximately equal to the cross-sectional area of the bore.
Claim 6
Dependent Claim
44 words
The invention as set forth in claim 2 wherein said trapezoidal-shaped passages have spaced parallel sides of major and minor lengths, and wherein said major length side of each passage is disposed more closely adjacent said imaginary vertical plane than said minor length sides.
Claim 7
Dependent Claim
140 words
In combination with a firearm barrel having a substantially uniform diameter bore of predetermined standard cross-sectional caliber and thereby adapted for use in firing projectiles of a corresponding caliber, an apparatus for reducing muzzle jump normally produced upon firing a projectile through the bore under the influence of an explosive material, said apparatus comprising at least two non-mechanically formed gas ports located directly within the barrel and extending between the periphery of said bore and the outer periphery of said barrel, said ports being generally symmetrically oriented within said Barrel and terminating at their innermost ends directly within a portion of the bore which is of the standard predetermined cross-sectional caliber so as to in no appreciable way detract from the normal and expected ballistic characteristics of the firearm barrel which would be attained in the absence of such ports.
Claim 8
Dependent Claim
140 words
In combination with a firearm barrel having a substantially uniform diameter bore of predetermined standard cross-sectional caliber and thereby adapted for use in firing projectiles of a corresponding caliber, an apparatus for reducing muzzle jump normally produced upon firing a projectile through the bore under the influence of an explosive material, said apparatus comprising at least two non-mechanically formed gas ports located directly within the barrel and extending between the periphery of said bore and the outer periphery of said barrel, said ports being generally symmetrically oriented within said Barrel and terminating at their innermost ends directly within a portion of the bore which is of the standard predetermined cross-sectional caliber so as to in no appreciable way detract from the normal and expected ballistic characteristics of the firearm barrel which would be attained in the absence of such ports.
Claim 9
Dependent Claim
29 words
The invention as set forth in claim 6 wherein said ports have at least one relatively straight side which extends upwardly and forwardly of the axis of the bore.
Claim 10
Dependent Claim
27 words
The invention as set forth in claim 7 wherein said ports are arranged approximately 30* from an imaginary vertical plane extending through the axis of the bore.
Claim 11
Dependent Claim
26 words
The invention as set forth in claim 6 wherein the total cross-sectional area of said ports is approximately equal to the cross-sectional area of the bore.
Claim 12
Dependent Claim
27 words
The invention as set forth in claim 6 wherein said ports are of a general trapezoidal shape and have spaced parallel sides of major and minor lengths.
References Cited (Backward Citations)
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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) | 1977-05-06 | 1977-11-05 | 1978-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-06 | 1981-11-05 | 1982-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-06 | 1985-11-05 | 1986-05-07 | $7700.00 | Window Closed / Lapsed |