US 12,111,140 B2
Projectile and firearm system
Paul K. Maurer, Nunnelly, TN (US); Brett E. Maurer, Rochester, NY (US); Todd F. Maurer, Franklin, TN (US); Paul Della Torre, Nunnelly, TN (US); Robert Tuchrelo, Williamson, NY (US); Nathan E. Smith, Hamlin, NY (US); and Richard T. Aab, Fairport, NY (US)
Filed by Crossbullet, LLC, Nunnelly, TN (US)
Filed on May 12, 2022, as Appl. No. 17/743,106.
Claims priority of provisional application 63/187,667, filed on May 12, 2021.
Prior Publication US 2022/0373308 A1, Nov. 24, 2022
Int. Cl. F42B 10/06 (2006.01); F42B 5/067 (2006.01)
CPC F42B 10/06 (2013.01) [F42B 5/067 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A cartridge for a firearm, the cartridge comprising:
(a) a projectile having (i) a body portion extending along a longitudinal axis, the elongate body portion having a transverse dimension configured to engage the bore;
(ii) a tail portion defining a rear end of the projectile and including a plurality of radially extending tail fins, the radially extending tail fins having a leading edge longitudinally intermediate the elongate body portion and the rear end of the projectile; and
(iii) a stem connecting the elongate body portion and the tail portion, wherein the stem has a stem diameter less than the transverse dimension;
wherein the body portion, the tail portion, and the stem are colinearly disposed along a longitudinal axis and define a fixed integral assembly with a projectile center of pressure and a projectile center of mass, the projectile center of pressure being longitudinally intermediate the rear end of the projectile and the projectile center of mass; and
(b) a casing coupled to the projectile, wherein at least a portion of the tail fins are disposed within the casing.