US 11,719,519 B2
Subsonic polymeric ammunition with diffuser
Lonnie Burrow, Carrollton, TX (US)
Assigned to TRUE VELOCITY IP HOLDINGS, LLC, Garland, TX (US)
Filed by TRUE VELOCITY IP HOLDINGS, LLC, Garland, TX (US)
Filed on Jul. 6, 2021, as Appl. No. 17/367,946.
Application 16/134,079 is a division of application No. 15/798,752, filed on Oct. 31, 2017, granted, now 11,047,654, issued on Jun. 29, 2021.
Application 15/798,752 is a division of application No. 14/725,587, filed on May 29, 2015, granted, now 9,885,551, issued on Feb. 6, 2018.
Application 14/011,202 is a division of application No. 13/292,843, filed on Nov. 9, 2011, granted, now 8,561,543, issued on Oct. 22, 2013.
Application 17/367,946 is a continuation of application No. 16/134,079, filed on Sep. 18, 2018, granted, now 11,085,741.
Application 14/725,587 is a continuation in part of application No. 14/011,202, filed on Aug. 27, 2013, granted, now 9,546,849, issued on Jan. 17, 2017.
Claims priority of provisional application 61/456,664, filed on Nov. 10, 2010.
Prior Publication US 2021/0341268 A1, Nov. 4, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. F42B 5/307 (2006.01); F42B 5/02 (2006.01); F42B 5/26 (2006.01); F42B 5/30 (2006.01)
CPC F42B 5/307 (2013.01) [F42B 5/02 (2013.01); F42B 5/26 (2013.01); F42B 5/30 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A subsonic ammunition comprising:
a primer insert comprises a top surface opposite a bottom surface, a substantially cylindrical coupling element extending away from the bottom surface forming, a primer recess in the top surface that extends toward the bottom surface, a primer flash aperture positioned in the primer recess to extend through the bottom surface, a flash aperture groove in the primer recess that extends circumferentially about the primer flash aperture, and a flange that extends circumferentially about an outer edge of the top surface;
a polymeric casing body comprising a generally cylindrical hollow polymer body molded over the substantially cylindrical coupling element, into the primer flash aperture to form a flash hole and into the flash aperture groove and extending toward a mid-body coupling joint;
a nose comprising a projectile aperture that extends to a neck connected to a shoulder that transitions from the projectile aperture to a nose coupler, wherein the nose coupler is connected to the mid-body coupling joint;
a propellant chamber formed between the projectile aperture and the primer flash aperture defining an internal volume; and
a propellant insert positioned in the propellant chamber to reduce the internal volume of the propellant chamber by at least 10%, wherein the propellant insert comprises a first passage comprising a first aperture having a first diameter about the diameter of the flash hole that transitions as an arc to a second passage that has a second diameter that is larger than the first diameter, wherein the first diameter has a uniformed diameter that extends to the second diameter.