# US 10,480,911 B2 · Primer insert having a primer pocket groove

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- Number: US 10,480,911 B2
- Document ID: US10480911B2
- Status: Granted
- Kind: B2
- Application number: 15/936,796
- Filed: 2018-03-27
- Published: 2018-09-20
- Granted: 2019-11-19
- Earliest claimed: 2010-11-20
- Assignees: True Velocity IP Holdings, LLC
- Applicants: True Velocity IP Holdings, LLC
- Inventors: Lonnie Burrow
- Web page: https://patentgrep.com/patent/US10480911B2

## CPC

- F42B 5/30: of plastics {, i.e. the cartridge-case tube is of plastics}
- F42B 5/02: Cartridges, i.e. cases with charge and missile
- F42B 5/025: {characterised by the dimension of the case or the missile}
- F42B 5/307: formed by assembling several elements
- F42B 33/00: Manufacture of ammunition; Dismantling of ammunition; Apparatus therefor (F42B5/188 takes precedence; manufacturing processes for hollow charges F42B1/036; manufacture of blasting cartridge initiators F42B3/195)
- F42B 33/001: {Devices or processes for assembling ammunition, cartridges or cartridge elements from parts}
- F42B 33/02: Filling cartridges, missiles, or fuzes; Inserting propellant or explosive charges {(F42B33/004 takes precedence)}
- F42C 19/0807: {characterised by the particular configuration of the transmission channels from the priming energy source to the charge to be ignited, e.g. multiple channels, nozzles, diaphragms or filters}
- F42C 19/0823: {Primers or igniters for the initiation or the propellant charge in a cartridged ammunition (primers for caseless ammunition F42C19/085)}
- F42C 19/083: {characterised by the shape and configuration of the base element embedded in the cartridge bottom, e.g. the housing for the squib or percussion cap}
- B22F 3/004: {Filling molds with powder (feeding material to presses in general B30B15/302)}
- B22F 3/10: Sintering only
- B22F 3/1025: {not by heating only}
- B22F 3/225: {by injection molding}
- B22F 5/00: Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F 5/06: of threaded articles, e.g. nuts
- B22F 2998/10: Processes characterised by the sequence of their steps
- C04B 35/64: Burning or sintering processes (C04B33/32 takes precedence {; powder metallurgy B22F})
- C22C 14/00: Alloys based on titanium
- C22C 33/0257: {characterised by the range of the alloying elements}
- C22C 33/0285: {with Cr, Co, or Ni having a minimum content higher than 5%}
- C22C 38/02: containing silicon
- C22C 38/04: containing manganese
- C22C 38/18: containing chromium
- C22C 38/42: with copper
- C22C 38/44: with molybdenum or tungsten
- C22C 38/48: with niobium or tantalum
- C22C 38/58: with more than 1.5% by weight of manganese
- F42B 5/313: all elements made of plastics
- F42B 33/04: Fitting or extracting primers in or from fuzes or charges {(F42B33/004 takes precedence)}
- F42B: EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION (explosive compositions C06B; fuzes F42C; blasting F42D)
- F42C: AMMUNITION FUZES (blasting cartridge initiators F42B3/10; chemical aspects C06C); ARMING OR SAFETY MEANS THEREFOR (filling fuzes F42B33/02; fitting or extracting primers in or from fuzes F42B33/04; containers for fuzes F42B39/30)
- B22F: WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER (making alloys by powder metallurgy C22C); APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE
- C22C: ALLOYS (treatment of alloys C21D, C22F)

## Abstract

The present invention provides a primer insert for use in a polymeric ammunition cartridge includes a top surface opposite a bottom surface and a extraction flange that extends circumferentially about an outer edge of the top surface; a coupling element that extends from the bottom surface, wherein the substantially cylindrical coupling element is adapted to receive a polymer overmolding; a primer recess in the top surface that extends toward the bottom surface, wherein the primer recess comprises a recess bottom and a circular recess side wall; a primer flash aperture through the recess bottom that extends through the bottom surface, wherein the primer flash aperture is adapted to receive a polymer overmolding to form a flash hole; and a groove in the primer recess positioned around the primer flash aperture adapted to receive a polymer overmolding, wherein the groove extends at least partially over the bottom surface and the groove is adapted to receive polymer at least partially over the bottom surface.

## Claims

### Claim 1

A primer insert for use in a polymeric ammunition cartridge comprising:
a top surface opposite a bottom surface and a extraction flange that extends circumferentially about an outer edge of the top surface;
a coupling element that extends from the bottom surface, wherein the coupling element is adapted to receive a polymer overmolding;
a primer recess in the top surface that extends toward the bottom surface, wherein the primer recess comprises a recess bottom and a circular recess side wall;
a primer flash aperture through the recess bottom that extends through the bottom surface, wherein the primer flash aperture is adapted to receive the polymer overmolding to form a flash hole; and
a groove in the primer recess positioned around the primer flash aperture adapted to receive the polymer overmolding, wherein the groove extends at least partially over the recess bottom and the groove is adapted to receive polymer at least partially over the recess bottom.

### Claim 2 (depends on 1)

The primer insert of claim 1, wherein the groove extends about half the distance from the primer flash aperture to the circular recess side wall.

### Claim 3 (depends on 1)

The primer insert of claim 1, wherein the groove extends about one third the distance from the primer flash aperture to the circular recess side wall.

### Claim 4 (depends on 1)

The primer insert of claim 1, wherein the groove extends about two third the distance from the primer flash aperture to the circular recess side wall.

### Claim 5 (depends on 1)

The primer insert of claim 1, wherein the groove extends to about the circular recess side wall.

### Claim 6 (depends on 1)

The primer insert of claim 1, wherein the coupling element comprises an inner surface adapted to receive a polymer overmolding and an outer surface adapted to receive a polymer overmolding.

### Claim 7 (depends on 1)

The primer insert of claim 1, wherein the primer insert has a caliber selected from .223, .243, .25-06, .270, .300, .308, .338, .30-30, .30-06, .45-70 or .50-90, 50 caliber, 45 caliber, 380 caliber or 38 caliber, 5.56 mm, 6 mm, 7 mm, 7.62 mm, 8 mm, 9 mm, 10 mm, or 12.7 mm.

### Claim 8 (depends on 1)

The primer insert of claim 1, wherein the primer insert is a 5.56 mm, 7.62 mm, .223, 308, 338, 12.7mm, and 0.50 caliber primer insert.

### Claim 9 (depends on 1)

The primer insert of claim 1, wherein the primer insert comprises a metal, an alloy, a polymer or a ceramic alloy.

### Claim 10 (depends on 1)

The primer insert of claim 1, wherein the primer insert comprises steel, nickel, chromium, copper, carbon, iron, stainless steel or brass.

### Claim 11 (depends on 1)

The primer insert of claim 1, wherein the primer insert comprises a 102, 174, 201, 202, 300, 302, 303, 304, 308, 309, 316, 316L, 316Ti, 321, 405, 408, 409, 410, 415, 416, 416R, 420, 430, 439, 440, 446 or 601-665 grade stainless steel.

### Claim 12 (depends on 1)

The primer insert of claim 1, wherein the primer insert comprises a Ti6A14V.

### Claim 13 (depends on 1)

The primer insert of claim 1, wherein the primer insert comprises a groove texture.