Method of reducing gun barrel heating
OwnerAndrew W. Sumaninventor
Life of this patent
Estimating the term…
Abstract
A cartridge includes a bullet on which there is formed a coating. At least an upper layer of the coating is porous and comprises a thermoset polymer and a filler. The filler may be a dry film lubricant. The cartridge may be used in a gun of the type that has a rifled barrel. A rifled barrel has a bore diameter and a groove diameter. The bullet may have a metal diameter that is less than the groove diameter but slightly greater than the bore diameter. The coated bullet may have a diameter that is greater than or equal to the groove diameter. When fired, the bullet produces less barrel friction and heating than a conventional bullet. The velocity of the coated bullets is greater and the velocity distribution is more narrow compared to uncoated bullets.
Claims20
A loaded gun, comprising:
- a gun loaded with a bullet;
- wherein the bullet has a metal core and a coating on the metal core;
- the coating comprising a thermoset polymer and a filler;
- the gun has a barrel with rifling that includes grooves and lands;
- the barrel has a bore diameter and a groove diameter;
- and
- the metal core has a diameter less than the groove diameter.
A bullet, comprising:
- a metal core;
- a coating over the metal core;
- wherein the coating comprises particles that individually comprise a first thermoset polymer and a filler;
- the particles comprise the filler in an amount that is from 15% to 40% by volume;
- and
- the particles are bound together to form a solid mass having discernable boundaries between individual particles.
Dependencies are inferred from the claim text.