# US 2019/0170488 A1 · Subsonic polymeric ammunition with diffuser > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0170488 A1 - Document ID: US20190170488A1 - Status: Published application - Kind: A1 - Application number: 16/266,311 - Filed: 2019-02-04 - Published: 2019-06-06 - Earliest claimed: 2010-11-10 - Assignees: True Velocity IP Holdings, LLC - Applicants: True Velocity IP Holdings, LLC - Inventors: Lonnie Burrow - Web page: https://patentgrep.com/patent/US20190170488A1 ## CPC - F42B 5/307: formed by assembling several elements - F42B 5/313: all elements made of plastics - F42B 5/02: Cartridges, i.e. cases with charge and missile - F42B 5/26: Cartridge cases (F42B5/18 takes precedence {; manufacturing of cartridge cases B21K21/04}) - F42B 5/30: of plastics {, i.e. the cartridge-case tube is of plastics} - F42B: EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION (explosive compositions C06B; fuzes F42C; blasting F42D) ## Abstract The present invention provides a subsonic ammunition including a polymeric casing body; a propellant insert positioned in the propellant chamber to reduce the internal volume of the propellant chamber; a propellant disposed and confined within the propellant chamber; a primer insert positioned at the body base and in communication with the propellant chamber; a primer and diffuser disposed in the primer insert in combustible communication with the propellant; and a projectile frictionally fitted in the mouth in combustible communication with the propellant. ## Claims ### Claim 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 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; a propellant insert positioned in the propellant chamber to reduce the internal volume of the propellant chamber by at least 10%; a propellant disposed in the propellant chamber; a diffuser ring having a diffuser aperture positioned in the primer recess aligned with the primer flash aperture; a primer disposed in the primer recess in contact with the diffuser ring in combustible communication with the propellant; and a projectile frictionally fitted in the projectile aperture in combustible communication with the propellant. ### Claim 2 (depends on 1) The subsonic ammunition of claim 1, wherein the internal volume is reduced by about 10.5, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, or 25%. ### Claim 3 (depends on 1) The subsonic ammunition of claim 1, wherein the projectile does not exceed the velocity of 1200 feet per second at sea level under standard atmospheric conditions when fired. ### Claim 4 (depends on 1) The subsonic ammunition of claim 1, wherein the projectile does not exceed the velocity of 1086 feet per second at standard atmospheric conditions when fired. ### Claim 5 (depends on 1) The subsonic ammunition of claim 1, wherein the projectile is a .22, .22-250, .223, .243, .25-06, .270, .300, .30-30, .30-40, 30.06, .300, .303, .308, .338, .357, 0.38, 0.380, 0.40, 0.44, .45, .45-70, .50 BMG, 5.45 mm, 5.56 mm, 6.5 mm, 6.8 mm, 7 mm, 7.62 mm, 8 mm, 9 mm, 10 mm, 12.7 mm, 14.5 mm, 20 mm, 25 mm, 30 mm, or 40 mm projectile. ### Claim 6 (depends on 1) The subsonic ammunition of claim 1, wherein the polymer body comprises a material selected from the group consisting of polyphenylsulfone, polycarbonate, and polyamide. ### Claim 7 (depends on 6) The subsonic ammunition of claim 6, further comprising at least one additive selected from the group consisting of plasticizers, lubricants, molding agents, fillers, thermo-oxidative stabilizers, flame-retardants, coloring agents, compatibilizers, impact modifiers, release agents, reinforcing fibers and reinforcing agents. ### Claim 8 (depends on 1) The subsonic ammunition of claim 1, wherein the propellant insert has a radial cross-section selected from the group consisting of circular, ovoid, octagonal, hexagonal, triangular, star, ribbed, square and a combination thereof. ### Claim 9 (depends on 1) The subsonic ammunition of claim 1, wherein the radial size of the propellant chamber tapers along its longitudinal direction. ### Claim 10 (depends on 1) The subsonic ammunition of claim 1, wherein the polymeric casing body and propellant insert are formed of different polymeric materials. ### Claim 11 (depends on 1) The subsonic ammunition of claim 1, wherein the polymeric casing body and propellant insert are formed of the same polymeric materials. ### Claim 12 (depends on 1) The subsonic ammunition of claim 1, wherein the propellant chamber is formed of a separate propellant insert disposed within the internal cavity of the generally cylindrical hollow polymer body. ### Claim 13 (depends on 1) The subsonic ammunition of claim 1, wherein the polymeric casing body, the propellant insert, and the nose independently comprise a polymers selected from the group consisting of polyurethane prepolymer, cellulose, fluoro-polymer, ethylene inter-polymer alloy elastomer, ethylene vinyl acetate, nylon, polyether imide, polyester elastomer, polyester sulfone, polyphenyl amide, polypropylene, polyvinylidene fluoride or thermoset polyurea elastomer, acrylics, homopolymers, acetates, copolymers, acrylonitrile-butadinen-styrene, thermoplastic fluoro polymers, inomers, polyamides, polyamide-imides, polyacrylates, polyatherketones, polyaryl-sulfones, polybenzimidazoles, polycarbonates, polybutylene, terephthalates, polyether imides, polyether sulfones, thermoplastic polyimides, thermoplastic polyurethanes, polyphenylene sulfides, polyethylene, polypropylene, polysulfones, polyvinylchlorides, styrene acrylonitriles, polystyrenes, polyphenylene, ether blends, styrene maleic anhydrides, polycarbonates, allyls, aminos, cyanates, epoxies, phenolics, unsaturated polyesters, bismaleimides, polyurethanes, silicones, vinylesters, urethane hybrids, polyphenylsulfones, copolymers of polyphenylsulfones with polyethersulfones or polysulfones, copolymers of poly-phenylsulfones with siloxanes, blends of polyphenylsulfones with polysiloxanes, poly(etherimide-siloxane) copolymers, blends of polyetherimides and polysiloxanes, and blends of polyetherimides and poly(etherimide-siloxane) copolymers. ### Claim 14 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 and into the flash aperture groove and extending toward a projectile aperture; a propellant chamber formed between the projectile aperture and the primer flash aperture; a propellant insert positioned in the propellant chamber to reduce the internal volume of the propellant chamber by at least 10%; a propellant disposed in the propellant chamber; a diffuser ring having a diffuser aperture positioned in the primer recess aligned with the primer flash aperture; a primer disposed in the primer recess in contact with the diffuser ring in combustible communication with the propellant; and a projectile frictionally fitted in the projectile aperture in combustible communication with the propellant. ### Claim 15 (depends on 14) The subsonic ammunition of claim 14, wherein the internal volume that is about 10.5, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, or 25% less than the open internal volume of a standard casing of equivalent caliber. ### Claim 16 (depends on 14) The subsonic ammunition of claim 14, wherein the projectile is a .22, .22-250, .223, .243, .25-06, .270, .300, .30-30, .30-40, 30.06, .300, .303, .308, .338, .357, 0.38, .380, .40, .44, .45, .45-70, .50 BMG, 5.45 mm, 5.56 mm, 6.5 mm, 6.8 mm, 7 mm, 7.62 mm, 8 mm, 9 mm, 10 mm, 12.7 mm, 14.5 mm, 20 mm, 25 mm, 30 mm, or 40 mm projectile. ### Claim 17 (depends on 15) The subsonic ammunition of claim 15, wherein the propellant insert has a radial cross-section selected from the group consisting of circular, ovoid, octagonal, hexagonal, triangular, star, ribbed, square and a combination thereof.