Jun 2, 2026

US12644684 - Ammunition cartridge

Systems, methods and apparatus are provided through which in some implementations an ammunition cartridge includes a cartridge casing having a longitudinal center axis, a powder pocket positioned adjacent to the cartridge casing, a piston bore positioned adjacent to the powder pocket, a piston in the piston bore, and a payload bay positioned adjacent to the payload bay, wherein the piston is not coupled to the cartridge, wherein the piston is in contact with the payload bay wherein a diameter of the powder pocket is less than an inside diameter of the cartridge casing to provide a reduced velocity to the payload.

Inventors: James Dunnam
Filing date: 2024-09-03

ammunitioncartridgefirearm

The patent describes an ammunition cartridge featuring a cartridge casing with a longitudinal center axis, a primer pocket, a powder pocket, a piston bore, and a payload bay, with the piston not being coupled to the casing. This design aims to reduce the velocity of the payload by ensuring the diameter of the powder pocket is less than the inside diameter of the cartridge casing.

Claim 1

1 . An ammunition cartridge comprising: a cartridge casing having a longitudinal center axis, a first end and a second end; a primer pocket positioned at the first end of the cartridge casing and positioned symmetrically along the longitudinal center axis, the primer pocket having a first end and a second end, the first end of the primer pocket being positioned at the first end of the cartridge casing; a powder pocket positioned at the second end of the primer pocket and positioned symmetrically along the longitudinal center axis, the powder pocket having a first end and a second end, the first end of the powder pocket being positioned at the second end of the primer pocket; a piston bore positioned at the second end of the powder pocket and positioned symmetrically along the longitudinal center axis, the piston bore having a first end and a second end, the first end of the piston bore being positioned at the second end of the powder pocket; a piston in the piston bore; and a payload bay positioned at a second end of the piston bore and positioned symmetrically along the longitudinal center axis, payload bay having a first end and a second end, the first end of the payload bay being positioned at a second end of the piston bore, the second end of the payload bay being positioned at the second end of the cartridge casing, wherein the piston is not coupled to the cartridge casing. a cartridge casing having a longitudinal center axis, a first end and a second end; a primer pocket positioned at the first end of the cartridge casing and positioned symmetrically along the longitudinal center axis, the primer pocket having a first end and a second end, the first end of the primer pocket being positioned at the first end of the cartridge casing; a powder pocket positioned at the second end of the primer pocket and positioned symmetrically along the longitudinal center axis, the powder pocket having a first end and a second end, the first end of the powder pocket being positioned at the second end of the primer pocket; a piston bore positioned at the second end of the powder pocket and positioned symmetrically along the longitudinal center axis, the piston bore having a first end and a second end, the first end of the piston bore being positioned at the second end of the powder pocket; a piston in the piston bore; and a payload bay positioned at a second end of the piston bore and positioned symmetrically along the longitudinal center axis, payload bay having a first end and a second end, the first end of the payload bay being positioned at a second end of the piston bore, the second end of the payload bay being positioned at the second end of the cartridge casing, wherein the piston is not coupled to the cartridge casing.

Google Patents

https://patents.google.com/patent/US12644684

USPTO PDF

https://image-ppubs.uspto.gov/dirsearch-public/print/downloadPdf/12644684