# US 11,992,736 B2 · Grooves of golf club heads and methods to manufacture grooves of golf club heads > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,992,736 B2 - Document ID: US11992736B2 - Status: Granted - Kind: B2 - Application number: 17/821,434 - Filed: 2022-08-22 - Published: 2022-12-22 - Granted: 2024-05-28 - Earliest claimed: 2008-08-07 - Assignees: Karsten Manufacturing Corporation - Applicants: Karsten Manufacturing Corporation - Inventors: Calvin S. Wang; Xiaojian Chen; David A. Higdon; Les J. Bryant; Martin R. Jertson; Anthony D. Serrano; John A. Solheim - Web page: https://patentgrep.com/patent/US11992736B2 ## CPC - A63B 53/0487: {for putters (A63B53/065 takes precedence)} - A63B 53/0433: {with special sole configurations} - A63B 53/0458: {with non-uniform thickness of the impact face plate} - A63B 53/0462: {characterised by tapering thickness of the impact face plate} - A63B 53/065: {for putters} - A63B 53/0408: {characterised by specific dimensions, e.g. thickness} - A63B 53/0416: {Heads having an impact surface provided by a face insert} - A63B 53/0425: {the face insert comprising two or more different materials} - A63B 53/0429: {the face insert comprising two or more layers of material} - A63B 53/0445: {Details of grooves or the like on the impact surface} - A63B 53/0466: {wood-type} - A63B 53/047: {iron-type} - Y10T 29/49: Method of mechanical manufacture - A63B: APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT (apparatus for passive exercising, massage A61H) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract Putter type club head with vertical groove patterns are described herein. A putter type club head comprises a putter face having a plurality of first curved grooves and a plurality of second curved grooves. The first curved grooves and the second curved grooves intersect each other at a plurality of points across the putter face. The width and depth of the first curved grooves and the second curved grooves can vary across the putter face in a direction extending from a heel end to a toe end, and/or in a direction extending from a top rail to a sole. The curved groove pattern provides consistent ball speed performance for any impact location on the putter face. ## Claims ### Claim 1 A putter type golf club head comprising: a putter face defined by a toe end, a heel end, a top rail and a sole, the putter type club face comprising a plurality of first curved grooves and a plurality of second curved grooves, each of the first curved grooves and the second curved grooves, and a plurality of land portions between the first curved grooves and the second curved grooves; wherein: the plurality of first curved grooves are parallel to each other; the plurality of second curved grooves are parallel to each other; the plurality of first curved grooves intersect the plurality of second curved grooves at a plurality of points along the plurality of second curved grooves; a width of at least one groove of the plurality of first curved grooves varies in a direction extending between the heel end and the toe end; a width of at least one groove of the plurality of second curved grooves varies in a direction extending between the heel end and the toe end; the land portions form areas on the putter face that contact a golf ball during impact; the area of the land portions varies in a direction extending between the heel end and the toe end; and the putter golf type club head has a loft angle less than 7 degrees. ### Claim 2 (depends on 1) The putter type golf club head of claim 1, wherein the area of the land portions varies in a direction extending between the top rail and the sole. ### Claim 3 (depends on 1) The putter type golf club head of claim 1, wherein a depth of at least one groove of the plurality of first curved grooves or the plurality of second curved grooves varies in a direction extending between the heel end and the toe end. ### Claim 4 (depends on 1) The putter type golf club head of claim 1, wherein a depth of the plurality of first curved grooves or the plurality of second curved grooves is greater at a center portion of the putter face than near the heel end and near the toe end. ### Claim 5 (depends on 1) The putter type golf club head of claim 1, wherein a depth of a portion of the plurality of first curved grooves or the plurality of second curved grooves ranges from 0.003 inch to 0.017 inch. ### Claim 6 (depends on 1) The putter type golf club head of claim 1, wherein a width of the plurality of first curved grooves or the plurality of second curved grooves is greater at a center portion of the putter face than near the heel end and near the toe end. ### Claim 7 (depends on 1) The putter type golf club head of claim 1, wherein the putter face comprises a face insert and the plurality of first curved grooves and the plurality of second curved grooves are disposed on the face insert. ### Claim 8 A putter type golf club head comprising: a putter face defined by a toe end, a heel end, a top rail and a sole, the putter type club face comprising a plurality of first curved grooves and a plurality of second curved grooves, each of the first curved grooves and the second curved grooves, and a plurality of land portions between the first curved grooves and the second curved grooves; wherein: the plurality of first curved grooves are parallel to each other; the plurality of second curved grooves are parallel to each other; the plurality of first curved grooves intersect the plurality of second curved grooves at a plurality of points along the plurality of second curved grooves; a width of at least one groove of the plurality of first curved grooves varies in a direction extending between the heel end and the toe end; a width of at least one groove of the plurality of second curved grooves varies in a direction extending between the heel end and the toe end; a depth of at least one groove of the plurality of first curved grooves varies in a direction extending between the heel end and the toe end; and a depth of at least one groove of the plurality of second curved grooves varies in a direction extending between the heel end and the toe end; and the putter golf type club head has a loft angle less than 7 degrees. ### Claim 9 (depends on 8) The putter type golf club head of claim 8, wherein the land portions form areas on the putter face that contact a golf ball during impact; and the area of the land portions varies in a direction extending between the heel end and the toe end. ### Claim 10 (depends on 9) The putter type golf club head of claim 9, wherein the area of the land portions varies in a direction extending between the top rail and the sole. ### Claim 11 (depends on 10) The putter type golf club head of claim 10, wherein a depth of the plurality of first curved grooves or the plurality of second curved grooves is greater at a center portion of the putter face than near the heel end and near the toe end. ### Claim 12 (depends on 8) The putter type golf club head of claim 8, wherein a width of the plurality of first curved grooves or the plurality of second curved grooves is greater at a center portion of the putter face than near the heel end and near the toe end. ### Claim 13 A putter type golf club head comprising: a putter face defined by a toe end, a heel end, a top rail and a sole, the putter type club face comprising a plurality of first curved grooves and a plurality of second curved grooves, each of the first curved grooves and the second curved grooves, and a plurality of land portions between the first curved grooves and the second curved grooves; wherein: the plurality of first curved grooves are parallel to each other; the plurality of second curved grooves are parallel to each other; the plurality of first curved grooves intersect the plurality of second curved grooves at a plurality of points along the plurality of second curved grooves; a width of at least one groove of the plurality of first curved grooves varies in a direction extending between the heel end and the toe end; a width of at least one groove of the plurality of second curved grooves varies in a direction extending between the heel end and the toe end; a width of the plurality of first curved grooves or the plurality of second curved grooves is greater at a center portion of the putter face than near the heel end and near the toe end; and the putter face comprises a face insert and the plurality of first curved grooves and the plurality of second curved grooves are disposed on the face insert; and the putter golf type club head has a loft angle less than 7 degrees. ### Claim 14 (depends on 13) The putter type golf club head of claim 13, wherein the land portions form areas on the putter face that contact a golf ball during impact; and the area of the land portions varies in a direction extending between the heel end and the toe end. ### Claim 15 (depends on 14) The putter type golf club head of claim 14, wherein the area of the land portions varies in a direction extending between the top rail and the sole. ### Claim 16 (depends on 13) The putter type golf club head of claim 13, wherein a depth of at least one groove of the plurality of first curved grooves or the plurality of second curved grooves varies in a direction extending between the heel end and the toe end. ### Claim 17 (depends on 16) The putter type golf club head of claim 16, wherein a depth of the plurality of first curved grooves or the plurality of second curved grooves is greater at a center portion of the putter face than near the heel end and near the toe end.