US 12,442,626 B2
Two-part polymer ammunition casing
John Cogger, Santa Ana, CA (US)
Assigned to Innovative Performance Applications, LLC, Orange, CA (US)
Filed by Innovative Performance Applications, LLC, Orange, CA (US)
Filed on Aug. 14, 2024, as Appl. No. 18/805,432.
Application 18/805,432 is a continuation of application No. 18/312,794, filed on May 5, 2023, granted, now 12,066,279.
Claims priority of provisional application 63/364,318, filed on May 6, 2022.
Prior Publication US 2024/0401919 A1, Dec. 5, 2024
Int. Cl. F42B 5/313 (2006.01); B21K 21/04 (2006.01); F42B 5/02 (2006.01); F42B 33/00 (2006.01)
CPC F42B 5/313 (2013.01) [B21K 21/04 (2013.01); F42B 33/001 (2013.01); F42B 5/02 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method of manufacturing a casing for an ammunition cartridge, the method comprising the steps of:
providing an injection mold;
utilizing the injection mold, injection molding a first polymer forming a first part of the casing, wherein the first part of the casing is generally cylindrically shaped along a longitudinal axis extending from a projectile end opposite a stepped end, the stepped end forming a first end of a mechanical connection;
removing at least a portion of the injection mold exposing the stepped end of the first end of the first part;
disposing an additional injection mold about the stepped end of the first end of the first part;
utilizing the additional injection mold, injection molding a second polymer forming a second part of the casing, wherein the second part includes a second stepped end forming a second end of the mechanical connection;
wherein the first end and the second end are mechanically locked together preventing a separation of the first part from the second part;
providing a thermal swagging tool; and
utilizing the thermal swagging tool, forming a conical tapered region along the projectile end of the first part.