Patents Assigned to Dunlop Sports Co. Ltd.
  • GOLF CLUB HEAD
    Publication number: 20180093145
    Abstract: A golf club head includes a striking face, a sole portion, a top portion, a hosel, a rear surface, a loft no less than 40°, a virtual vertical plane, and a center of gravity. The striking face has a face center, a leading edge, and a virtual striking face plane. The hosel includes an internal bore configured to receive a golf shaft and includes a peripheral side wall and a shaft abutment surface configured to abut a tip end of the golf shaft. The rear surface is opposite the striking face and has an upper portion and a lower portion, the lower portion including a forward-extending recess. The insert covers the recess forming a hollow portion. The virtual vertical plane is perpendicular to the striking face plane and passes through the face center. The center of gravity is spaced a distance from the virtual vertical plane in the heel-to-toe direction.
    Type: Application
    Filed: July 10, 2017
    Publication date: April 5, 2018
    Applicant: DUNLOP SPORTS CO. LTD.
    Inventor: Pat RIPP
  • GOLF BALL
    Publication number: 20180093138
    Abstract: An object of the present invention is to provide a golf ball excellent in durability. The present invention provides a golf ball comprising a constituent member containing a crosslinked rubber component and a polyrotaxane component, wherein the polyrotaxane has a cyclodextrin, a linear molecule piercing through the cyclic structure of the cyclodextrin, and blocking groups located at both terminals of the linear molecule to prevent disassociation of the cyclodextrin, and at least a part of hydroxyl groups of the cyclodextrin is modified with a caprolactone chain via —O—C3H6—O— group.
    Type: Application
    Filed: September 8, 2017
    Publication date: April 5, 2018
    Applicant: Dunlop Sports Co., Ltd.
    Inventors: Toshiyuki TARAO, Mami TANAKA
  • GOLF CLUB HEAD
    Publication number: 20180093144
    Abstract: A golf club head includes a striking face having a face center and a virtual striking face plane generally parallel to the striking face. The golf club head further includes a sole portion, a top portion, a rear portion, and a loft L no less than 40°. A virtual vertical plane perpendicular to the striking face plane passes through the face center. A club head center of gravity is spaced from the virtual vertical plane in the heel-to-toe direction by a distance D1 that is no greater than 6.0 mm. The golf club head further includes a hosel including an internal bore configured to receive a golf shaft. The internal bore includes a peripheral side wall and a shaft abutment surface configured to abut a tip end of the golf club shaft. The hosel further comprises an auxiliary recess extending sole-ward from the abutment surface of the internal bore.
    Type: Application
    Filed: November 3, 2016
    Publication date: April 5, 2018
    Applicant: DUNLOP SPORTS CO., LTD.
    Inventor: Pat RIPP
  • Golf club head
    Patent number: 9931551
    Abstract: The golf club head includes a crown portion, a face portion, a sole portion, at least one recessed portion formed in one of the crown portion and the sole portion, at least one weight member configured to be attached to the recessed portion. The weight member has an upper surface, a lower surface and a side surface. The recessed portion is provided with a bottom surface correspond to the lower surface of the weight member, a first side wall surface that is continuous with the bottom surface and corresponds to the side surface of the weight member, and a second side wall surface that is continuous with the first side wall surface and constitutes an opening periphery of the recessed portion, and the second side wall surface is formed along the first side wall surface at a larger outer diameter than the first side wall surface.
    Type: Grant
    Filed: December 20, 2016
    Date of Patent: April 3, 2018
    Assignee: DUNLOP SPORTS CO. LTD.
    Inventor: Naruhiro Mizutani
  • Golf ball
    Patent number: 9931542
    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: Grant
    Filed: July 10, 2017
    Date of Patent: April 3, 2018
    Assignee: DUNLOP SPORTS CO. LTD.
    Inventors: Hidetaka Inoue, Kazuya Kamino, Kohei Mimura, Toshiyuki Tarao, Mami Tanaka
  • Golf club with tool for engaging a weight body and screw
    Patent number: 9931546
    Abstract: A golf club 2 includes a head 4, a shaft 6, a grip 8, a first member m1 detachably attached, a second member m2 detachably attached, and a tool 102. A minimum force required to detach the first member m1 from the tool 102 in a connection state of the tool 102 and the first member m1 is defined as F1. A minimum force required to detach the second member m2 from the tool 102 in a connection state of the tool 102 and the second member m2 is defined as F2. The force F1 is greater than the force F2.
    Type: Grant
    Filed: May 26, 2015
    Date of Patent: April 3, 2018
    Assignee: DUNLOP SPORTS CO. LTD.
    Inventor: Naruhiro Mizutani
  • GOLF CLUB
    Publication number: 20180078829
    Abstract: A shaft of a golf club includes a reverse-tapered engagement part. The reverse-tapered engagement part includes a sleeve having a reverse-tapered shape, and a reverse-tapered outer surface. A hosel part of a head includes a reverse-tapered inner surface and a hosel slit. A hosel hole includes the reverse-tapered inner surface having a shape corresponding to that of the reverse-tapered outer surface. Either one of the reverse-tapered outer surface and the reverse-tapered inner surface includes an abutting engagement surface and a non-abutting engagement surface. The other of the reverse-tapered outer surface and the reverse-tapered inner surface includes a first abutting surface and the second abutting surface. In the golf club, a first state and a second state in which club lengths are different from each other can be achieved.
    Type: Application
    Filed: August 28, 2017
    Publication date: March 22, 2018
    Applicants: DUNLOP SPORTS CO. LTD., SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventors: Masahide ONUKI, Yuki MOTOKAWA, Naruhiro MIZUTANI
  • Golf club grip and golf club
    Patent number: 9919191
    Abstract: An object of the present invention is to provide a golf club grip showing a good feeling both at hitting and at waggling. The present invention provides a golf club grip comprising a cylindrical portion for inserting a shaft, wherein the cylindrical portion has a compression strain in a range from 46% to 55% at a compression stress of 20 kg/cm2, and a compression strain in a range from 63% to 69% at a compression stress of 120 kg/cm2.
    Type: Grant
    Filed: November 13, 2015
    Date of Patent: March 20, 2018
    Assignee: DUNLOP SPORTS CO. LTD.
    Inventors: Hidetaka Inoue, Kuniyasu Horiuchi, Toshiyuki Tarao, Kazuyoshi Shiga, Sho Goji, Chiemi Mikura, Hitoshi Oyama, Hiroshi Hasegawa
  • PUTTER-TYPE GOLF CLUB HEAD
    Publication number: 20180071596
    Abstract: A putter-type golf club head is disclosed. When oriented in a reference position, the putter-type golf club head comprises a blade member and a central elongate member in communication with, and extending rearwardly from, the blade member. The blade member extends in a heel-to-toe direction and has a striking wall defining a substantially planar striking surface, and an upper surface of the central elongate member comprises at least one generally square-shaped alignment element.
    Type: Application
    Filed: November 15, 2017
    Publication date: March 15, 2018
    Applicant: DUNLOP SPORTS CO. LTD.
    Inventors: Mika BECKTOR, Keith DOLEZEL, Nick TRAHAN, Phillip C. SEAGRAM, Brian HERR, Jeff BRUNSKI, Adam SHELDON
  • GOLF CLUB SHAFT
    Publication number: 20180071598
    Abstract: An EI value at a point P16 separated by 16 inches from a tip end Tp is defined as E16, a shaft wall thickness at the point P16 is defined as T16, an EI value at a point P6 separated by 6 inches from the tip end Tp is defined as E6, and a shaft wall thickness at the point P6 is defined as T6. In a shaft 6, E16 is 2.4 (kgf·m2) or more, E6 is 2.7 (kgf·m2) or less, and E16/E6 is 0.95 or more but 1.50 or less, E6/T6 is 1.9 or less, and E16/T16 is 3.0 or more. A high-elasticity partial reinforcement layer including a fiber having a tensile elastic modulus of 30 (t/mm2) or more but 40 (t/mm2) or less is disposed in at least a part of a region falling within a range of ±4 inches from the point P16.
    Type: Application
    Filed: August 28, 2017
    Publication date: March 15, 2018
    Applicant: DUNLOP SPORTS CO. LTD.
    Inventor: Hirotaka NAKAMURA
  • Golf ball
    Patent number: 9914021
    Abstract: An object of the present invention is to provide a golf ball traveling a great distance on driver shots.
    Type: Grant
    Filed: April 19, 2016
    Date of Patent: March 13, 2018
    Assignee: DUNLOP SPORTS CO. LTD.
    Inventors: Kohei Mimura, Takahiro Sajima, Kosuke Tachibana
  • Muscle-back, with insert, iron type golf club head
    Patent number: 9908018
    Abstract: A muscle-back iron golf club head includes a blade-like upper mass, a muscle-like lower mass, a planar front surface, a top surface, a sole surface, a heel surface, a toe surface, and a rear surface having a first contour. A recess is in the rear surface, the recess having a first portion in the blade-like upper mass and a second portion in the muscle-like lower mass. An insert may be provided in the recess, and such insert may substantially fill the recess and may include a back surface having a second contour which is different from the first contour of the club head rear surface.
    Type: Grant
    Filed: July 17, 2014
    Date of Patent: March 6, 2018
    Assignee: Dunlop Sports Co. Ltd.
    Inventors: Douglas E. Roberts, Trent E. Garner, Kevin A. Wolfe, Daniel J. Stone, Christopher J. Beck, Todd D. Harman, Brent L. Newsome, Michael J. Wallans, Nathaniel J. Radcliffe
  • GOLF CLUB HEAD WITH TEXTURED STRIKING FACE
    Publication number: 20180056147
    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 hounded 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: October 25, 2017
    Publication date: March 1, 2018
    Applicant: DUNLOP SPORTS CO. LTD.
    Inventors: Patrick RIPP, Jeff D. BRUNSKI
  • GOLF BALL
    Publication number: 20180056137
    Abstract: A golf ball includes a spherical core, and a cover covering the spherical core. The spherical core is formed from a rubber composition including a base rubber, a co-cross-linking agent, a cross-linking initiator, an unsaturated fatty acid and/or a metal salt thereof, and an aromatic carboxylic acid and/or a metal salt thereof, the co-cross-linking agent includes an ?,?-unsaturated carboxylic acid having 3 to 8 carbon atoms and/or a metal salt thereof, the unsaturated fatty acid and metal salt thereof excludes an ?,?-unsaturated carboxylic acid having 3 to 8 carbon atoms and a metal salt thereof, and the rubber composition includes a metal compound when the co-cross-linking agent contains only an ?,?-unsaturated carboxylic acid having 3 to 8 carbon atoms.
    Type: Application
    Filed: August 7, 2017
    Publication date: March 1, 2018
    Applicant: DUNLOP SPORTS CO. LTD.
    Inventors: Hikaru NAGAKURA, Kazuyoshi Shiga, Chiemi Mikura
  • GOLF BALL
    Publication number: 20180056136
    Abstract: A golf ball 2 has a plurality of dimples 12 and a land 14 on a surface thereof. The golf ball 2 further has a large number of minute projections 18 formed on surfaces of the dimples 12 and the land 14. An average depth Fav of the dimples 12 and an average height Hav of the minute projections 18 satisfy the following mathematical formula (1). Hav<Fav*0.05??(1) An average value Pav of pitches P between the minute projections 18 and other minute projections 18 adjacent to the minute projections 18 is not less than 10 ?m and not greater than 2000 ?m.
    Type: Application
    Filed: July 14, 2017
    Publication date: March 1, 2018
    Applicant: DUNLOP SPORTS CO. LTD.
    Inventors: Kohei MIMURA, Takahiro SAJIMA
  • GOLF BALL
    Publication number: 20180056138
    Abstract: A golf ball has a plurality of dimples 12 and a land 14 on a surface thereof. The golf ball further has a large number of minute projections 18 formed on surfaces of the dimples 12 and the land 14. An average pitch Pav of these minute projections 18 is less than 100 ?m. An average height Hav of these minute projections 18 is not less than 0.5 ?m and not greater than 50 ?m. The golf ball satisfies the following mathematical formula. Lav<3*Tav In the mathematical formula, Lav represents an average value of distances L between the minute projections 18 and other minute projections 18 adjacent to the minute projections 18, and Tav represents an average value of widths T of these minute projections 18.
    Type: Application
    Filed: July 28, 2017
    Publication date: March 1, 2018
    Applicant: DUNLOP SPORTS CO. LTD.
    Inventors: Takahiro SAJIMA, Kohei MIMURA
  • Golf club head
    Patent number: 9901791
    Abstract: A golf club according to the present invention includes a golf club head body that has a crown portion and a sole portion and has an opening surrounded by the crown portion and the sole portion, and a face member that covers the opening of the golf club head body. The face member is formed in the shape of a cup having a face portion formed in a plate shape and a peripheral portion that extends from the peripheral edge of the face portion. In the peripheral portion of the face member, the portion that extends along the crown portion includes a first toe-side edge portion arranged on the toe side, a first heel-side edge portion arranged on the heel side, and a first central edge portion arranged between the first toe-side edge portion and the first heel-side edge portion.
    Type: Grant
    Filed: December 28, 2015
    Date of Patent: February 27, 2018
    Assignee: DUNLOP SPORTS CO. LTD.
    Inventors: Naruhiro Mizutani, Hiroshi Abe, Daisuke Kohno
  • Golf club
    Patent number: 9901790
    Abstract: A club includes a head, a shaft, and a grip. A club length L1 is 43 inches or greater and 48 inches or less. A ratio (Wh/Wc) between a head weight Wh and a club weight Wc is equal to or greater than 0.70. An inertia moment Ix about swing axis is 6.90×103 (kg·cm2) or greater and 7.50×103 (kg·cm2) or less. A static moment Mt (kg·cm) of the club is equal to or greater than 16.3 (kg·cm). The frequency of vibration of club is 240 (cpm) or greater and 280 (cpm) or less. The inertia moment Ix (kg·cm2) is calculated by Equation (1): Ix=Wc×(Lc+60)2+Ic??(1).
    Type: Grant
    Filed: November 24, 2015
    Date of Patent: February 27, 2018
    Assignee: DUNLOP SPORTS CO. LTD.
    Inventor: Takashi Nakamura
  • Golf club head
    Patent number: D813966
    Type: Grant
    Filed: October 18, 2016
    Date of Patent: March 27, 2018
    Assignee: DUNLOP SPORTS CO. LTD.
    Inventors: Keith Dolezel, Mika Becktor, Phillip C. Seagram
  • Golf club head
    Patent number: D813967
    Type: Grant
    Filed: October 18, 2016
    Date of Patent: March 27, 2018
    Assignee: DUNLOP SPORTS CO. LTD.
    Inventors: Patrick Ripp, Brent Newsome, Mika Becktor, Phillip C. Seagram, Keith Dolezel