# US 8,771,098 B2 · Multiple material putter > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,771,098 B2 - Document ID: US8771098B2 - Status: Granted - Kind: B2 - Application number: 13/570,081 - Filed: 2012-08-08 - Published: 2014-02-13 - Granted: 2014-07-08 - Earliest claimed: 2012-08-08 - Assignees: Callaway Golf Company - Applicants: Thomas R. Hilton - Inventors: Thomas R. Hilton - Web page: https://patentgrep.com/patent/US8771098B2 ## CPC - A63B 53/04: Heads - A63B 53/065: {for putters} - A63B 53/007: {Putters} - A63B 53/0487: {for putters (A63B53/065 takes precedence)} - A63B 60/00: Details or accessories of golf clubs, bats, rackets or the like - A63B 60/54: with means for damping vibrations - A63B 53/0416: {Heads having an impact surface provided by a face insert} - A63B 53/0433: {with special sole configurations} - A63B 53/0441: {with visual indicators for aligning the golf club} - A63B 53/0445: {Details of grooves or the like on the impact surface} - A63B 2053/0491: {with added weights, e.g. changeable, replaceable} - A63B 2209/00: Characteristics of used materials - A63B: APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT (apparatus for passive exercising, massage A61H) ## Abstract A golf club putter having a low head center of gravity and a high MOI is disclosed herein. The putter has a metal body comprising a face and a hosel, a low density dampening layer affixed to the body, and a high density rear weight affixed to the dampening layer, and the dampening layer has a first surface that forms an angle with an opposing second surface that is inversely proportional to the distance of the hosel from a heel side of the body. ## Claims ### Claim 1 A putter comprising: a body comprising a face and a hosel; a dampening layer comprising a first front surface and a first rear surface; and a rear weight comprising a second front surface and a second rear surface, wherein the face comprises a striking surface and a third rear surface, wherein the dampening layer is affixed to the third rear surface, wherein the rear weight is affixed to the dampening layer, wherein the second front surface comprises a recess sized to receive a portion of the dampening layer, wherein a portion of the dampening layer is disposed within the recess, and wherein the first front surface is not parallel with the first rear surface. ### Claim 2 (depends on 1) The putter of claim 1, wherein the dampening layer is composed of urethane. ### Claim 3 (depends on 1) The putter of claim 1, wherein the rear weight is composed of a high density metal alloy. ### Claim 4 (depends on 1) The putter of claim 1, wherein the rear weight comprises tungsten. ### Claim 5 (depends on 1) The putter of claim 1, wherein the body is composed of carbon steel. ### Claim 6 (depends on 1) The putter of claim 1, wherein the body and the rear weight each have a dark color, and wherein the dampening layer has a light color. ### Claim 7 (depends on 6) The putter of claim 6, wherein the dark color is black, and wherein the light color is white. ### Claim 8 (depends on 1) The putter of claim 1, wherein the striking surface comprises a textured pattern. ### Claim 9 (depends on 8) The putter of claim 8, wherein the textured pattern is machined into the striking surface. ### Claim 10 (depends on 1) The putter of claim 1, wherein the putter has a moment of inertia of no less than 3200 g-cm2 and no more than 5500 g-cm2. ### Claim 11 (depends on 1) The putter of claim 1, wherein an angle created by the first front surface with respect to the first rear surface is inversely proportional to the distance between the hosel and a heel side or a toe side of the putter body. ### Claim 12 (depends on 1) The putter of claim 1, wherein the striking surface is disposed on a face insert, and wherein the face insert is disposed within a recess in the face. ### Claim 13 A putter comprising: a carbon steel body comprising a face, a rear side, a heel side, a toe side, and a hosel disposed proximate the heel side; a urethane dampening layer comprising a first surface and a second surface; and a tungsten alloy rear weight comprising a third surface and a fourth surface, wherein the face comprises a recess sized to receive a face insert, wherein a portion of the dampening layer has an approximately triangular shape, wherein the first surface is affixed to the rear side, wherein the third surface is affixed to the second surface, wherein the first surface forms a first angle with the second surface, wherein the third surface forms a second angle with the fourth surface, and wherein the first angle and the second angle add up to 90°. ### Claim 14 (depends on 13) The putter of claim 13, wherein the first angle is no less than 1° and no greater than 45°. ### Claim 15 (depends on 13) The putter of claim 13, wherein the dampening layer and the rear weight are removably affixed to the body with one or more fasteners. ### Claim 16 (depends on 13) The putter of claim 13, wherein the dampening layer and the rear weight are permanently affixed to the body. ### Claim 17 A putter comprising: a metal body comprising a face, a rear side, a heel side, a toe side, and a hosel; a low density dampening layer comprising a first surface and a second surface; and a high density rear weight comprising a recess, wherein a portion of the dampening layer is disposed within the recess, wherein the first surface is affixed to the rear side, wherein the first surface forms a first angle with the second surface, wherein the first angle is greater than 0° and less than 90°, wherein the magnitude of the first angle is inversely proportional to a distance between the hosel and a heel side or a toe side of the putter body, wherein the body and the rear weight each have a first color, and wherein the dampening layer has a contrasting second color, and wherein the putter has a moment of inertia of no less than 3200 g-cm2 and no more than 5500 g-cm2. ### Claim 18 (depends on 17) The putter of claim 17, wherein the first color is black and the second color is white. ### Claim 19 (depends on 17) The putter of claim 17, wherein the first angle is approximately 20°.