Maine Patent of the Month – October 2022
Maine-based Ammo and Bullet Manufacturing, Inc. have built a reputation as a personal production facility for their customers. This reputation has come after years of designing and manufacturing high-grade ammunition, wherein every single cartridge is produced to the highest standards.
The company recently designed and patented a gas-purged ammunition cartridge. This design introduces a gas into the casing of the cartridge. The gas then creates a chemical interaction in the cartridge, reacting with the propellant, primer, casing, and projectile. This reaction purges air from the cartridge using an inert gas.
In some cases, gas is delivered into the casing using a jetting valve during manufacturing to install a gas-deliver tube. Other designs use gas tight containers, like glove boxes. The solution largely depends on the ammunition type. For instance, the glove box might be used for ammunition manufactured in fixtures that carry casings. In any case, a gas tight seal is required to prevent gas from escaping.
Depending on the gas used, benefits include preservation of the cartridge’s shelf life, a mitigated muzzle flash, and even a boosted propellant performance. This process is achieved using gases that promote the oxidation of the propellant. This includes nitrous oxides, oxygen, or any oxygen/noble gas mixture with greater than 30% oxygen content.
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