# US 11,353,277 B2 · Sound suppressor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,353,277 B2 - Document ID: US11353277B2 - Status: Granted - Kind: B2 - Application number: 16/855,387 - Filed: 2020-04-22 - Published: 2021-10-28 - Granted: 2022-06-07 - Earliest claimed: 2020-04-22 - Assignees: Battle Born Supply Co. - Applicants: Battle Born Supply Co. - Inventors: Ian Muceus; Adam Stempeck - Web page: https://patentgrep.com/patent/US11353277B2 ## CPC - F41A 21/30: Silencers - B22F 5/106: {Tube or ring forms} - F41A 21/32: Muzzle attachments or glands (F41A21/26, F41A21/30, F41A21/46 take precedence {; for projectile velocity measurements G01P3/665, G01P3/685}) - B22F 10/00: Additive manufacturing of workpieces or articles from metallic powder (apparatus or devices therefor B22F12/00) - B22F 2005/004: {Article comprising helical form elements (B22F5/085 takes precedence)} - B33Y 10/00: Processes of additive manufacturing - B33Y 70/00: Materials specially adapted for additive manufacturing - B33Y 80/00: Products made by additive manufacturing - Y02P 10/25: Process efficiency - F41A: FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE - 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 - B33Y: ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING - Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS ## Abstract Noise suppressors for firearms are disclosed, having a cylindrical body extending along a longitudinal direction, a chamber having an annular cylindrical shape, and a suppression core in the chamber. The chamber has an outer diameter defined by an inner surface of the body, an inner diameter forming a center bore, and a length along the longitudinal direction. The suppression core has a triply periodic minimal surfaces (TPMS) structure. A wall thickness or unit cell size of the TPMS structure may vary along longitudinal or radial directions. The suppression core may have an inner portion and an outer portion, where at a transition between the inner and outer portions, a plurality of first openings in the inner portion and a plurality of second openings in the outer portion have a parameter that matches in size with each other, and the first and second openings are approximately aligned with each other. ## Claims ### Claim 1 A noise suppressor for a firearm comprising: a cylindrical body extending along a longitudinal direction; a chamber having an annular cylindrical shape, and having i) an outer diameter defined by an inner surface of the body, ii) an inner diameter forming a center bore, and iii) a length along the longitudinal direction; and a suppression core in the chamber, comprising a triply periodic minimal surfaces (TPMS) structure; wherein a wall thickness of the TPMS structure varies along the longitudinal direction and in a radial direction in the chamber. ### Claim 2 (depends on 1) The noise suppressor of claim 1 wherein the TPMS structure comprises a plurality of unit cells arranged circumferentially around the center bore. ### Claim 3 (depends on 1) The noise suppressor of claim 1 wherein: the length of the chamber has an entry end and an exit end opposite the entry end, the entry end being configured to be adjacent to a muzzle of the firearm; and the wall thickness of the TPMS structure decreases between the entry end and the exit end. ### Claim 4 (depends on 1) The noise suppressor of claim 1 wherein: the length of the chamber has an entry end and an exit end opposite the entry end, the entry end being configured to be adjacent to a muzzle of the firearm; and a unit cell size of the TPMS structure decreases between the entry end and the exit end. ### Claim 5 (depends on 1) The noise suppressor of claim 1 wherein a unit cell size of the TPMS structure varies in the longitudinal direction and in a radial direction. ### Claim 6 (depends on 1) The noise suppressor of claim 1 wherein: the suppression core has an inner portion adjacent to the center bore and an outer portion surrounding the inner portion; the inner portion and the outer portion are concentric; the outer portion comprises the TPMS structure; and at a transition between the inner portion and the outer portion, a plurality of first openings in the inner portion and a plurality of second openings in the outer portion have a parameter that matches in size with each other, and the plurality of first openings and the plurality of second openings are approximately aligned with each other. ### Claim 7 (depends on 6) The noise suppressor of claim 6 wherein a first baffle geometry of the inner portion is different from a second baffle geometry of the outer portion. ### Claim 8 A noise suppressor for a firearm comprising: a cylindrical body extending along a longitudinal direction; a chamber having an annular cylindrical shape, and having i) an outer diameter defined by an inner surface of the body, ii) an inner diameter forming a center bore, and iii) a length along the longitudinal direction; and a suppression core in the chamber, comprising a triply periodic minimal surfaces (TPMS) structure; wherein a wall thickness of the TPMS structure varies in a radial direction in the chamber; and wherein: the suppression core has an annular cylinder adjacent to the center bore and a baffle structure surrounding the annular cylinder; the annular cylinder and the baffle structure are concentric; the baffle structure comprises the TPMS structure; and at a transition between the annular cylinder and the baffle structure, a plurality of first openings in the annular cylinder and a plurality of second openings in the baffle structure have a parameter that matches in size with each other, and the plurality of first openings and the plurality of second openings are approximately aligned with each other. ### Claim 9 (depends on 8) The noise suppressor of claim 8 wherein the TPMS structure comprises a plurality of unit cells arranged circumferentially around the center bore. ### Claim 10 (depends on 8) The noise suppressor of claim 8 wherein the wall thickness decreases from the center bore to the outer diameter of the chamber. ### Claim 11 (depends on 8) The noise suppressor of claim 8 wherein: the parameter is a length in the longitudinal direction of the chamber; each first opening in the plurality of first openings has a first length in the longitudinal direction of the chamber; and at the transition between the annular cylinder and the baffle structure, each second opening in the plurality of second openings has a second length in the longitudinal direction matching the first length. ### Claim 12 (depends on 8) The noise suppressor of claim 8 wherein the annular cylinder comprises an array of structures having rectangular or diamond shaped cross-sections in the longitudinal direction. ### Claim 13 A noise suppressor for a firearm comprising: a cylindrical body extending along a longitudinal direction; a chamber having an annular cylindrical shape, and having i) an outer diameter defined by an inner surface of the body, ii) an inner diameter forming a center bore, and iii) a length along the longitudinal direction; and a suppression core in the chamber, the suppression core comprising an annular cylinder adjacent to the center bore and a baffle structure surrounding the annular cylinder, the annular cylinder and the baffle structure being concentric; wherein the baffle structure comprises a triply periodic minimal surfaces (TPMS) structure; and wherein at a transition between the annular cylinder and the baffle structure, a plurality of first openings in the annular cylinder and a plurality of second openings in the baffle structure have a parameter that matches in size with each other, and the plurality of first openings and the plurality of second openings are approximately aligned with each other. ### Claim 14 (depends on 13) The noise suppressor of claim 13 wherein the TPMS structure comprises a plurality of unit cells arranged circumferentially around the center bore. ### Claim 15 (depends on 13) The noise suppressor of claim 13 wherein: the parameter is a length in the longitudinal direction of the chamber; each first opening in the plurality of first openings has a first length in the longitudinal direction of the chamber; and at the transition between the annular cylinder and the baffle structure, each second opening in the plurality of second openings has a second length in the longitudinal direction matching the first length. ### Claim 16 (depends on 13) The noise suppressor of claim 13 wherein the annular cylinder comprises an array of structures having rectangular or diamond shaped cross-sections in the longitudinal direction. ### Claim 17 (depends on 13) The noise suppressor of claim 13 wherein the annular cylinder comprises a second TPMS structure that is different from the TPMS structure of the baffle structure. ### Claim 18 (depends on 13) The noise suppressor of claim 13 wherein: the length of the chamber has an entry end and an exit end opposite the entry end, the entry end being configured to be adjacent to a muzzle of the firearm; and a wall thickness of the TPMS structure decreases between the entry end and the exit end.