Patents Assigned to Dunlop Sports Co. Ltd.
  • GOLF BALL
    Publication number: 20180050238
    Abstract: An object of the present invention is to provide a golf ball traveling a great flight distance. The present invention provides a golf ball comprising a spherical core and a cover covering the spherical core, wherein the golf ball has a ratio (t2/t1) of a time (t2) to a time (t1) of 1.05 or more in a hitting test using a driver (at a head speed of 40 m/sec), wherein the time (t1) is a time taken from a moment that the driver begins to contact with the golf ball to a moment that the golf ball reaches a maximum deformation amount, and the time (t2) is a time taken from the moment that the golf ball reaches the maximum deformation amount to a moment that the golf ball leaves the driver.
    Type: Application
    Filed: October 27, 2017
    Publication date: February 22, 2018
    Applicant: Dunlop Sports Co. Ltd.
    Inventors: Ryota SAKAMINE, Kazuyoshi SHIGA, Hikaru NAGAKURA, Takahiro SHIGEMITSU
  • Golf club head
    Patent number: 9895581
    Abstract: A head 2 includes a head body h1, a face part Fp1, and a connecting part Cn1. The face part Fp1 includes a face surface f1 and a face back surface f2. The connecting part Cn1 connects the face back surface f2 of the face part Fp1 and the head body h1 to each other. The connecting part Cn1 may be provided at a position separated from a peripheral edge of the face back surface f2. The peripheral edge of the face back surface f2 may be separated from the head body h1. The face part Fp1 may include a face middle region R1 and a face peripheral region R2. The connecting part Cn1 may be provided only in the face middle region R1.
    Type: Grant
    Filed: March 4, 2015
    Date of Patent: February 20, 2018
    Assignee: DUNLOP SPORTS CO. LTD.
    Inventor: Masahide Onuki
  • GOLF CLUB GRIP AND GOLF CLUB
    Publication number: 20180043224
    Abstract: An object of the present invention is to provide a golf club grip having excellent grip performance under a wet condition. The present invention provides a golf club grip having an outermost surface layer, wherein the outermost surface layer contains (A) a crosslinked rubber and (B) a silica, and has, at at least a part thereof, a region where a spherical silica secondary particle with a particle size of 3 ?m or more exists in an amount of at least two particles/mm2. If a spherical silica secondary particle with a particle size of 3 ?m or more exists in a given amount at at least a part of the outermost surface layer, the golf club grip has an improved grip performance under a wet condition.
    Type: Application
    Filed: August 11, 2017
    Publication date: February 15, 2018
    Applicants: Dunlop Sports Co. Ltd., Sumitomo Rubber Industries, Ltd.
    Inventors: Sho GOJI, Kazuyoshi SHIGA
  • Golf club head
    Patent number: 9889348
    Abstract: Provided is a golf club head which produces an improved hitting sound obtained without impairing the appearance of the sole section. A golf club head having a hollow portion (i) formed therein has a sole portion (5) which forms the bottom surface of the head. The sole portion (5) includes a thin-wall portion (8) and a thick-wall portion (9) which has a greater thickness than the thin-wall portion (8). The golf club head is characterized in that a portion of the inner surface of the thick-wall portion (9), the portion facing the hollow section, has a rib (10) secured to the portion by welding.
    Type: Grant
    Filed: November 22, 2013
    Date of Patent: February 13, 2018
    Assignee: DUNLOP SPORTS CO. LTD.
    Inventor: Yuki Motokawa
  • GOLF BALL
    Publication number: 20180036602
    Abstract: A golf ball 2 includes a core 4, a mid layer 6, a reinforcing layer 8, and a cover 10. When distances (%) from the central point of the core 4 to nine points and JIS-C hardnesses at the nine points, which are obtained by dividing a region from the central point of the core 4 to the surface of the core 4 at intervals of 12.5% of the radius of the core 4, are plotted in a graph, R2 of a linear approximation curve obtained by a least-square method is equal to or greater than 0.95. The difference (H(100)-H(0)) between a JIS-C hardness H(100) at the surface of the core 4 and a JIS-C hardness H(0) at the central point of the core 4 is equal to or greater than 15.
    Type: Application
    Filed: October 6, 2017
    Publication date: February 8, 2018
    Applicant: DUNLOP SPORTS CO. LTD.
    Inventors: Yoshiko TAKUBO, Kazuhiko ISOGAWA, Kosuke TACHIBANA
  • GOLF CLUB SHAFT
    Publication number: 20180036612
    Abstract: A shaft 6 includes a tip end Tp and a butt end Bt. If a shaft length is defined as Ls, a distance between the butt end Bt of the shaft and a center of gravity G of the shaft is defined as Lg, and a ratio of the distance Lg to the shaft length Ls is defined as a ratio of the center of gravity of the shaft, then the ratio of the center of gravity of the shaft is equal to or less than 47%. The shaft length Ls is equal to or less than 991 mm. If a forward flex is defined as F1 (mm) and a backward flex is defined as F2 (mm), a flex point ratio C1 of the shaft calculated by the following formula (1) is equal to or less than 39%: C1=[F2/(F1+F2)]×100]??(1).
    Type: Application
    Filed: August 4, 2017
    Publication date: February 8, 2018
    Applicant: DUNLOP SPORTS CO. LTD.
    Inventor: Hiroyuki TAKEUCHI
  • GOLF BALL
    Publication number: 20180036599
    Abstract: A golf ball 2 includes a main body 4 and a paint film 6. The paint film 6 includes an inner layer 14 and an outer layer 16. A modulus Min of the inner layer 14 is higher than a modulus Mout of the outer layer 16. A difference (Min?Mout) is not less than 25 kgf/cm2. The golf ball 2 has a plurality of dimples 18. A ratio So of a sum of areas of the dimples 18 relative to a surface area of a phantom sphere of the golf ball 2 and a ratio Rs of a number of the dimples 18 each having a diameter of not less than 9.60% and not greater than 10.37% of a diameter of the golf ball 2, relative to a total number of the dimples 18, satisfy the following mathematical formula (1). Rs??2.
    Type: Application
    Filed: July 10, 2017
    Publication date: February 8, 2018
    Applicant: DUNLOP SPORTS CO. LTD.
    Inventors: Hidetaka INOUE, Kazuya KAMINO, Kohei MIMURA, Toshiyuki TARAO, Mami TANAKA
  • Golf ball resin composition and golf ball
    Patent number: 9884225
    Abstract: An object of the present invention is to provide a material for obtaining a golf ball having excellent shot feeling and flight distance. The present invention provides a golf ball resin composition having a ratio (flexural elastic modulus/slab hardness) of a flexural elastic modulus (MPa) to a slab hardness (Shore D hardness) in a range from 3 to 5, and containing, as a resin component, (A) a polyamide resin, (B) at least one selected from the group consisting of (b-1) a binary copolymer, (b-2) a metal ion-neutralized product of a binary copolymer, (b-3) a ternary copolymer and (b-4) a metal ion-neutralized product of a ternary copolymer, and (C) a thermoplastic elastomer.
    Type: Grant
    Filed: March 11, 2016
    Date of Patent: February 6, 2018
    Assignee: DUNLOP SPORTS CO. LTD.
    Inventors: Hidetaka Inoue, Toshiyuki Tarao, Mami Tanaka
  • Golf ball
    Patent number: 9884226
    Abstract: An object of the present invention is to provide a golf ball excellent in hitting durability. The present invention provides a golf ball comprising a spherical core and at least one cover layer covering the spherical core, wherein at least a part of the spherical core is formed from a rubber composition containing (a) a base rubber, (b) a co-crosslinking agent, (c) a crosslinking initiator, and (x) an olefin-alkyl (meth)acrylate copolymer, and a content of (x) the olefin-alkyl (meth)acrylate copolymer in the rubber composition ranges from 0.5 part by mass to 7.0 parts by mass with respect to 100 parts by mass of (a) the base rubber.
    Type: Grant
    Filed: June 30, 2015
    Date of Patent: February 6, 2018
    Assignee: DUNLOP SPORTS CO. LTD.
    Inventors: Satoko Okabe, Masatoshi Yokota
  • GOLF BALL
    Publication number: 20180028873
    Abstract: A golf ball 2 includes a core 4, one or more mid layers 6, a cover 8, and dimples 10. A central hardness Ho and a surface hardness Hs of the core 4, a hardness Hm(min) of a layer having a lowest hardness among the mid layers 6, and a hardness Hc of the cover 8 satisfy the following mathematical formulas (1) to (4). Hs?Ho>15??(1) Hc?Hm(min)>20??(2) ?10<Hm(min)?Ho<15??(3) 5<Hc?Hs<20??(4) An occupation ratio So and a ratio Rs of a number of the dimples 10 each having a diameter of from 9.60% to 10.37% of a diameter of the golf ball 2, relative to a total number of the dimples 10, satisfy the following mathematical formula (5). Rs??2.
    Type: Application
    Filed: June 15, 2017
    Publication date: February 1, 2018
    Applicant: DUNLOP SPORTS CO. LTD.
    Inventors: Hironori TAKIHARA, Takahiro SAJIMA, Kohei MIMURA
  • GOLF CLUB HEAD WITH TEXTURED STRIKING FACE
    Publication number: 20180028878
    Abstract: A golf club head includes a striking face with a plurality of scorelines. A first virtual vertical plane is perpendicular to the striking face and passes through a toe-wardmost extent of the scorelines, and a second virtual vertical plane is parallel to the first virtual vertical plane and passes through a heel-wardmost extent of the scorelines. A central region bounded by the first virtual vertical plane, the second virtual vertical plane, and a striking face periphery has a first average surface roughness Ra1 of between about 40 ?in and about 180 ?in. And a majority of a toe region bounded by the first vertical plane and the striking face periphery is textured to have a second average surface roughness Ra2 no less than 1.5 times Ra1.
    Type: Application
    Filed: July 26, 2016
    Publication date: February 1, 2018
    Applicant: DUNLOP SPORTS CO. LTD.
    Inventors: Patrick RIPP, Jeff D. BRUNSKI
  • Golf club and golf club set
    Patent number: 9878219
    Abstract: A golf club 4 includes a head hd and a sole surface 12. The sole surface 12 includes a ridgeline RL extending from a toe side toward a heel side, a leading surface Si positioned on a face side of the ridgeline RL and inclined upward toward the face side, and a trailing surface S2 positioned on a back side of the ridgeline RL and inclined upward toward the back side. Inclination angles at respective positions of the trailing surface S2 are defined as ?2c at a central position, ?2t at a toe reference position, and ?2h at a heel reference position. Then, the head hd satisfies at least one of the following (a) and (b): (a) The inclination angle ?2t is greater than the inclination angle ?2c (b) The inclination angle ?2h is greater than the inclination angle ?2c.
    Type: Grant
    Filed: February 27, 2017
    Date of Patent: January 30, 2018
    Assignee: DUNLOP SPORTS CO. LTD.
    Inventor: Yuki Shimahara
  • Golf club fitting apparatus
    Patent number: 9881137
    Abstract: Provided is a fitting apparatus that accurately and objectively determines an optimal swingability index, which is a swingability index of a golf club suited to a golfer. The fitting apparatus is provided with an acquisition unit, a calculation unit, and a determination unit. The acquisition unit acquires a measurement value obtained by measuring a swing action of a test club by the golfer with a measurement device. The calculation unit calculates a swing index indicating a feature amount of the swing action, based on the measurement value. The determination unit determines the optimal swingability index, according to a magnitude of the swing index.
    Type: Grant
    Filed: July 31, 2015
    Date of Patent: January 30, 2018
    Assignees: DUNLOP SPORTS CO. LTD., SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventors: Kousuke Okazaki, Masatoshi Kato, Masahiko Ueda, Naoyoshi Ueda, Shimpei Oyama
  • Golf ball
    Patent number: 9873025
    Abstract: An object of the present invention is to provide a golf ball showing improved durability by improving adhesion to a constituent member comprising a polyurethane in the golf ball. The present invention provides a golf ball comprising a center and n envelope layers (n is a natural number of 1 or more) covering the center, wherein at least one envelope layer is a polyurethane envelope layer comprising a polyurethane as a principal component, and the polyurethane envelope layer and a constituent member adjacent to the polyurethane envelope layer are adhered with an adhesive resin composition, and wherein the adhesive resin composition comprises a base material including a urethane polyol and an epoxy resin, and a curing agent including a polyamine compound, and a content of the urethane polyol in the base material is 5 mass % or more and less than 40 mass %.
    Type: Grant
    Filed: October 5, 2015
    Date of Patent: January 23, 2018
    Assignee: DUNLOP SPORTS CO. LTD.
    Inventors: Yoshiko Matsuyama, Masatoshi Yokota, Hirokazu Okamoto, Kazuo Yagi
  • Golf ball
    Patent number: 9873022
    Abstract: An object of the present invention is to provide a golf ball having a low spin rate on driver shots. The present invention provides a golf ball comprising a spherical core and at least one cover layer covering the spherical core, wherein the spherical core is formed from a rubber composition containing (a) base rubber, (b) an ?,?-unsaturated carboxylic acid having 3 to 8 carbon atoms and/or a metal salt thereof as a co-crosslinking agent, (c) a crosslinking initiator and (d) a carboxylic acid having a benzene ring and/or a salt thereof, provided that the rubber composition further contains (e) a metal compound in case of containing only (b) the ?,?-unsaturated carboxylic acid having 3 to 8 carbon atoms as the co-crosslinking agent.
    Type: Grant
    Filed: September 22, 2015
    Date of Patent: January 23, 2018
    Assignee: DUNLOP SPORTS CO. LTD.
    Inventors: Ryota Sakamine, Chiemi Mikura, Shun Kurihara, Ayaka Shindo
  • Golf ball
    Patent number: 9873023
    Abstract: An object of the present invention is to provide a golf ball having an excellent initial velocity when being hit at a head speed of 50 m/sec and an improved initial velocity when being hit at a head speed of 40 m/sec. The present invention provides a golf ball comprising a spherical core and at least one cover covering the spherical core, wherein the spherical core is formed from a core rubber composition containing (a) a base rubber, (b) a co-crosslinking agent, (c) a crosslinking initiator and (x) a crosslinked rubber powder, and (x) the crosslinked rubber powder is formed from a rubber composition containing (a1) a base rubber, (b1) a co-crosslinking agent, (c1) a crosslinking initiator and (r) a resin component.
    Type: Grant
    Filed: July 29, 2016
    Date of Patent: January 23, 2018
    Assignee: DUNLOP SPORTS CO. LTD.
    Inventors: Ryota Sakamine, Hikaru Nagakura, Kazuyoshi Shiga, Takahiro Shigemitsu
  • Golf club head
    Patent number: D808482
    Type: Grant
    Filed: October 5, 2016
    Date of Patent: January 23, 2018
    Assignee: DUNLOP SPORTS CO. LTD.
    Inventor: Patrick A. Ripp
  • Golf club head
    Patent number: D809081
    Type: Grant
    Filed: July 22, 2016
    Date of Patent: January 30, 2018
    Assignee: DUNLOP SPORTS CO. LTD.
    Inventors: Mika Becktor, Keith F. Dolezel, Phillip C. Seagram
  • Golf club head
    Patent number: D810850
    Type: Grant
    Filed: October 18, 2016
    Date of Patent: February 20, 2018
    Assignee: DUNLOP SPORTS CO. LTD.
    Inventors: Mika Becktor, Phillip C. Seagram, Keith Dolezel, Patrick Ripp, Brent Newsome
  • Golf club head
    Patent number: D810852
    Type: Grant
    Filed: October 18, 2016
    Date of Patent: February 20, 2018
    Assignee: DUNLOP SPORTS CO. LTD.
    Inventors: Keith Dolezel, Mika Becktor, Phillip C. Seagram