Polymer ammunition casing
US12066279B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 5, 2023 |
| Grant date | Aug 20, 2024 |
| Priority date | — |
| Expiry date | May 5, 2043 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF42B5/02
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method of manufacturing a casing for an ammunition cartridge includes injection molding a polymer forming the casing using an injection mold. The casing is cylindrically shaped along a longitudinal axis extending from a base to a distal end with a blind hole formed therein. The blind hole has a primer retention feature disposed at the base and leads into a flash hole. An insulator and/or reflector is placed around at least a portion of the casing separating the base from the neck. A heater directly heats the neck of the casing while not directly heating the base. A stretch rod is inserted into the blind hole stretching the neck. The casing is inserted into a blow mold and pressurized causing the neck of the casing to be blow molded. At least a portion of the distal end of the casing is removed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.