# US 10,245,479 B2 · Multi-material golf club head > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,245,479 B2 - Document ID: US10245479B2 - Status: Granted - Kind: B2 - Application number: 15/375,877 - Filed: 2016-12-12 - Published: 2017-05-18 - Granted: 2019-04-02 - Earliest claimed: 2015-11-18 - Assignees: Acushnet Company - Applicants: Acushnet Company - Inventors: Stephen S. Murphy; Charles E. Golden; Mark C. Myrhum; Richard L. Cleghorn; Uday V. Deshmukh; Nick Frame - Web page: https://patentgrep.com/patent/US10245479B2 ## CPC - A63B 53/0466: {wood-type} - A63B 60/50: with through-holes (A63B60/18 takes precedence; for stringing purposes A63B49/00) - A63B 60/52: with slits - A63B 53/0408: {characterised by specific dimensions, e.g. thickness} - A63B 53/0433: {with special sole configurations} - A63B 53/0437: {with special crown configurations} - A63B 60/002: {Resonance frequency related characteristics} - A63B 2209/00: Characteristics of used materials - A63B 2209/02: with reinforcing fibres, e.g. carbon, polyamide fibres - A63B: APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT (apparatus for passive exercising, massage A61H) ## Abstract A golf club head made out of multi-material is disclosed herein. More specifically, the golf club head in accordance with the present invention has at least a portion of the body of the golf club head that is further comprised out of a base layer and a lightweight cover layer. The base layer may have a plurality of cutouts to help reduce unnecessary mass and the lightweight cover layer may be made out of an ultra-lightweight material to further reduce the unnecessary mass. The present invention achieves this without sacrificing the sound performance of the golf club head. ## Claims ### Claim 1 A golf club head comprising: a striking face portion located at a frontal portion of said golf club head; and a body portion attached to an aft portion of said striking face portion further comprising a crown portion and a sole portion; wherein at least one of said crown portion or said sole portion further comprises a base layer and a lightweight cover layer; said base layer further comprises a plurality of cutouts, and said lightweight cover layer has an Internal Exposure Percentage of between about 25% to about 45%; and wherein said golf club head produces a sound that has a Critical Time Tcritical of greater than about 0.01 seconds and less than about 0.02 seconds; said Critical Time Tcritical is defined as the amount of time it take said sound to oscillate from a peak amplitude Apeak to a point of 10% of said peak amplitude Apeak. ### Claim 2 (depends on 1) The golf club head of claim 1, wherein said Critical Time Tcritical is greater than about 0.015 seconds and less than about 0.02 seconds. ### Claim 3 (depends on 2) The golf club head of claim 2, wherein said Critical Time Tcritical is greater than about 0.0175 seconds and less than about 0.02 seconds. ### Claim 4 (depends on 3) The golf club head of claim 3, wherein said lightweight cover layer has an Internal Exposure Percentage of between about 20% to about 50%. ### Claim 5 (depends on 1) The golf club head of claim 1, wherein said lightweight cover layer is made out of a material with a density of less than about 2.7 g/cm3. ### Claim 6 (depends on 5) The golf club head of claim 5, wherein said lightweight cover layer is made out of a material with a density of less than about 1.75 g/cm3. ### Claim 7 (depends on 6) The golf club head of claim 6, wherein said lightweight cover layer is made out of a material with a density of less than about 1.50 g/cm3. ### Claim 8 A golf club head comprising: a striking face portion located at a frontal portion of said golf club head; and a body portion attached to an aft portion of said striking face portion further comprising a crown portion and a sole portion; wherein at least one of said crown portion or said sole portion further comprises a base layer wherein said golf club head produces a sound that has a Critical Time Tcritical of greater than about 0.01 seconds and less than about 0.02 seconds; said Critical Time Tcritical is defined as the amount of time it take said sound to oscillate from a peak amplitude Apeak to a point of 10% of said peak amplitude Apeak. ### Claim 9 (depends on 8) The golf club head of claim 8, wherein said Critical Time Tcritical is greater than about 0.015 seconds and less than about 0.02 seconds. ### Claim 10 (depends on 9) The golf club head of claim 9, wherein said Critical Time Tcritical is greater than about 0.0175 seconds and less than about 0.02 seconds. ### Claim 11 (depends on 10) The golf club head of claim 10, wherein said base layer has a maximum thickness of less than about 0.50 mm, and said lightweight cover layer has a maximum thickness of less than about 0.30 mm. ### Claim 12 (depends on 11) The golf club head of claim 11, wherein said base layer has a maximum thickness of less than about 0.40 mm, and said lightweight cover layer has a maximum thickness of less than about 0.25. ### Claim 13 (depends on 12) The golf club head of claim 12, wherein said base layer has a maximum thickness of less than about 0.35 mm, and said lightweight cover layer has a maximum thickness of less than about 0.20. ### Claim 14 (depends on 11) The golf club head of claim 11, wherein said base layer is made out of a material with a density of between about 4.0 g/cm3 and about 4.7 g/cm3. ### Claim 15 (depends on 14) The golf club head of claim 14, wherein said base layer is made out of a material with a density of between about 4.1 g/cm3 and about 4.6 g/cm3. ### Claim 16 (depends on 15) The golf club head of claim 15, wherein said lightweight cover layer is made out of a material with a density of less than about 2.7 g/cm3. ### Claim 17 (depends on 16) The golf club head of claim 16, wherein said lightweight cover layer is made out of a material with a density of less than about 1.75 g/cm3. ### Claim 18 (depends on 17) The golf club head of claim 17, wherein said lightweight cover layer is made out of a material with a density of less than about 1.50 g/cm3. ### Claim 19 A golf club head comprising: a striking face portion located at a frontal portion of said golf club head; and a body portion attached to an aft portion of said striking face portion further comprising a crown portion and a sole portion; wherein at least one of said crown portion or said sole portion further comprises a base layer and a lightweight cover layer; said base layer does not contain any cutouts, and said lightweight cover layer has an Internal Exposure Percentage of 0%; and wherein said golf club head produces a sound that has a Critical Time Tcritical of greater than about 0.01 seconds and less than about 0.02 seconds; said Critical Time Tcritical is defined as the amount of time it take said sound to oscillate from a peak amplitude Apeak to a point of 10% of said peak amplitude Apeak.