# US 2021/0239443 A1 · Connector pin for feedthroughs and method for production > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0239443 A1 - Document ID: US20210239443A1 - Status: Published application - Kind: A1 - Application number: 17/237,428 - Filed: 2021-04-22 - Published: 2021-08-05 - Earliest claimed: 2018-10-22 - Assignees: Schott AG - Applicants: Schott AG - Inventors: Helmut Hartl - Web page: https://patentgrep.com/patent/US20210239443A1 ## CPC - F42B 3/10: Initiators therefor (percussion fuzes F42C7/00; percussion caps F42C19/10; electric primers F42C19/12) - F42C 19/06: Electric contact parts specially adapted for use with electric fuzes {(switches operated by change of speed H01H35/06; switches operated by change of acceleration, e.g. shock or vibration, inertia switches H01H35/14; fluid-pressure-operated switches H01H35/24)} - F42B 3/103: Mounting initiator heads in initiators; Sealing-plugs - F42B 3/11: characterised by the material used, e.g. for initiator case or electric leads (F42B3/107 takes precedence) - F42B 3/195: Manufacture - H01R 12/55: characterised by the terminals - H01R 12/58: terminals for insertion into holes - 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) - H01R: ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS ## Abstract The disclosure relates to a connector pin, in particular a metal pin, for feedthroughs, in particular glass-metal feedthroughs, with at least one first, elongated portion, as well as at least one adjoining end portion, and the end portion has a rounding with at least radius R. The disclosure is further characterized in that the cone and/or radius R is preferably a cone and/or radius according to a specification and is obtained by means of a material-removing method and/or a non-material-removing method. ## Claims ### Claim 1 A connector pin for feedthroughs, comprising: at least one first, elongated, cylindrical portion having a diameter D; and at least one adjoining end portion, wherein the end portion has a fillet and/or a fillet portion with a radius, and the fillet and/or the fillet portion has at least the form of a circular segment with radius R, wherein the radius R is a radius according to a specification, and is obtained with a material-removing method and/or a non-material-removing method. ### Claim 2 (depends on 1) The connector pin according to claim 1, wherein the radius R of the fillet and/or of the fillet portion is in the range of 0.4·D to 0.65·D. ### Claim 3 (depends on 1) The connector pin according to claim 1, wherein the end portion has an end face F, the surface of which is essentially perpendicular to a pin axis A, and at which the fillet portion with the radius R adjoins and forms the transition to an outer circumferential surface of the cylindrical portion. ### Claim 4 (depends on 3) The connector pin according to claim 3, wherein the end face (F) has a diameter of less than 0.4 mm. ### Claim 5 (depends on 1) The connector pin according to claim 1, wherein the non-material-removing method comprises reshaping methods. ### Claim 6 (depends on 1) The connector pin according to claim 1, wherein the material-removing method comprises a method selected from the group consisting of lathing, milling, and grinding. ### Claim 7 (depends on 1) The connector pin according to claim 1, wherein the connector pin has a pin surface, wherein the pin surface in the cylindrical portion is free of Al2O3 and SiC. ### Claim 8 (depends on 1) The connector pin according to claim 1, wherein less than 2% of the total pin surface has contaminants selected from the group consisting of Al2O3, SiC, and combinations thereof. ### Claim 9 (depends on 1) The connector pin according to claim 1, wherein the pin surface comprises a coating. ### Claim 10 (depends on 9) The connector pin according to claim 9, wherein the coating is a nickel coating and the layer thickness of the nickel coating is in the range of 2 to 8 μm, and/or the coating is a gold coating and the layer thickness of the gold coating is in the range of 0.5 to 5 μm. ### Claim 11 (depends on 9) The connector pin according to claim 9, wherein the coating is largely free of defects. ### Claim 12 (depends on 1) The connector pin according to claim 1, wherein the radius R is from 0.25 mm to 1.0 mm, and/or the diameter D is from 0.5 mm to 2.0 mm. ### Claim 13 (depends on 1) A feedthrough comprising at least one connector pin according to claim 1. ### Claim 14 (depends on 13) The feedthrough according to claim 13, wherein the feedthrough comprises an opening, wherein the connector pin is passed through the opening in a glass or glass-ceramic material. ### Claim 15 A method for the production of a connector pin, for a feedthrough, comprising the steps of: providing a connector pin blank made of a wire material with at least one end portion; and introducing a fillet and/or a fillet portion with radius R according to a specification, with a material-removing method and/or a non-material-removing method at the end portion of the wire material, resulting in a rounded end portion of the connector pin. ### Claim 16 (depends on 15) The method according to claim 15, further comprising the step of providing the connector pin with a coating. ### Claim 17 (depends on 1) The connector pin according to claim 1, wherein the connector pin is a metal pin. ### Claim 18 (depends on 2) The connector pin according to claim 2, the radius R of the fillet and/or of the fillet portion is in the range of 0.45·D to 0.55·D. ### Claim 19 (depends on 15) The method according to claim 15, wherein the connector pin is a metal pin.