Patents Assigned to Dunlop Sports
  • GOLF BALL RESIN COMPOSITION AND GOLF BALL
    Publication number: 20180171128
    Abstract: An object of the present invention is to provide a material from which a golf ball having excellent resilience and durability can be obtained.
    Type: Application
    Filed: November 14, 2017
    Publication date: June 21, 2018
    Applicant: Dunlop Sports Co. Ltd.
    Inventor: Takahiro SHIGEMITSU
  • GOLF BALL
    Publication number: 20180169481
    Abstract: A golf ball 2 includes a core 4 and a cover 6. A difference (FB2?FC2) between a secondary natural frequency FB2 of the golf ball 2 and a secondary natural frequency FC2 of the core 4 is greater than 420 Hz and not greater than 760 Hz. Preferably, a sum (FB2+FC2) is not greater than 5200 Hz. Preferably, the FC2 is not less than 1700 Hz and not greater than 2400 Hz. Preferably, the FB2 is not less than 2250 Hz and not greater than 3050 Hz. Preferably, an amount of compressive deformation Dc of the core 4 is 2.30 to 3.90 mm. Preferably, an amount of compressive deformation Db of the golf ball 2 is 1.80 to 3.30 mm. Preferably, a thickness Tc of the cover 6 is 1.00 to 2.30 mm. Preferably, a Shore D hardness Hc of the cover 6 is 54 to 67.
    Type: Application
    Filed: October 16, 2017
    Publication date: June 21, 2018
    Applicant: DUNLOP SPORTS CO. LTD.
    Inventors: Takahiro SAJIMA, Hironori TAKIHARA
  • GOLF BALL
    Publication number: 20180169480
    Abstract: A golf ball 2 includes a core 4, a mid layer 6, a cover 8, and dimples 10. A Shore C hardness Hmc of the mid layer 6 is greater than a Shore C hardness Hs at a surface of the core 4. A Shore D hardness He of the cover 8 is less than a Shore D hardness Hm of the mid layer 6. Peak values and orders of maximum peaks of data constellations of the golf ball 2 are calculated. A minimum value of the peak values is not less than 95 mm. A minimum value of the orders is not less than 27, and a maximum value of the orders is not greater than 37. An average of the orders is not less than 30 and not greater than 34.
    Type: Application
    Filed: October 17, 2017
    Publication date: June 21, 2018
    Applicant: DUNLOP SPORTS CO. LTD.
    Inventors: Hidetaka INOUE, Kazuya KAMINO, Takahiro SAJIMA, Kohei MIMURA
  • GOLF BALL RESIN COMPOSITION AND GOLF BALL
    Publication number: 20180171127
    Abstract: An object of the present invention is to provide a golf ball resin composition having improved rebound resilience performance.
    Type: Application
    Filed: November 13, 2017
    Publication date: June 21, 2018
    Applicant: Dunlop Sports Co. Ltd.
    Inventors: Takahiro SHIGEMITSU, Hidetaka INOUE
  • GOLF BALL
    Publication number: 20180169482
    Abstract: A golf ball includes a core and a cover. A difference (FB2?FC2) between a secondary natural frequency FB2 of the golf ball and a secondary natural frequency FC2 of the core is not less than 80 Hz and not greater than 420 Hz. The golf ball having a sum (FB2+FC2) of not less than 4000 Hz is preferable. Preferably, the FC2 is not less than 1800 Hz and not greater than 2500 Hz. Preferably, the FB2 is not less than 2000 Hz and not greater than 2800 Hz. Preferably, an amount of compressive deformation Dc is 2.30 mm to 3.90 mm. Preferably, an amount of compressive deformation Db is 1.80 mm to 3.30 mm. Preferably, a thickness Tc is 0.80 mm to 2.10 mm. Preferably, a Shore D hardness Hc is not less than 52 and not greater than 65.
    Type: Application
    Filed: November 15, 2017
    Publication date: June 21, 2018
    Applicant: DUNLOP SPORTS CO. LTD.
    Inventors: Takahiro SAJIMA, Hironori TAKIHARA
  • GOLF BALL
    Publication number: 20180161629
    Abstract: A golf ball 2 has a large number of dimples 10 on a surface thereof. Fifteen axes are assumed for a phantom sphere of the golf ball 2. 30240 points on a predetermined region of the surface of the golf ball 2 during backspin about each axis are determined. A length L1 of a perpendicular line that extends from each point to the axis is calculated. A total length L2 is calculated by summing 21 lengths L1 calculated based on 21 perpendicular lines arranged in a direction of the axis. A transformed data constellation is obtained by performing Fourier transformation on a data constellation of 1440 total lengths L2 calculated along a direction of rotation about the axis. A peak value and an order of a maximum peak of the transformed data constellation are calculated. A minimum value of 15 peak values is not less than 95 mm.
    Type: Application
    Filed: September 28, 2017
    Publication date: June 14, 2018
    Applicant: DUNLOP SPORTS CO. LTD.
    Inventors: Kohei MIMURA, Takahiro SAJIMA
  • GOLF BALL
    Publication number: 20180161634
    Abstract: A golf ball 2 includes a core 4, a mid layer 6 positioned outside this core, and a cover 8 positioned outside this mid layer. When a total thickness of the mid layer 6 and the cover 8 is denoted by L (mm), a Shore C hardness at a point A away from a surface of the core 4 toward a central point of the core 4 by 5L (mm) is denoted by Ha, a Shore C hardness at a point B away from the surface of the core 4 toward the central point of the core 4 by 2.5L (mm) is denoted by Hb, and a Shore C hardness at the central point of the core 4 and Shore C hardnesses of the mid layer 6 and the cover 8 are denoted by H0, Hm, and Hc, respectively; the golf ball 2 satisfies Hc?Hb>0, Hm?H0>0, and Ha?Hm>0.
    Type: Application
    Filed: October 10, 2017
    Publication date: June 14, 2018
    Applicant: DUNLOP SPORTS CO. LTD.
    Inventors: Hironori TAKIHARA, Takahiro SAJIMA
  • GOLF BALL
    Publication number: 20180161632
    Abstract: A golf ball includes a core, one or more mid layers, a cover, and dimples. A central hardness Ho and a surface hardness Hs of the core, a hardness Hm(min) of a layer having a lowest hardness among the mid layers, and a hardness Hc of the cover satisfy the following mathematical formulas (i) to (iv).
    Type: Application
    Filed: September 25, 2017
    Publication date: June 14, 2018
    Applicant: DUNLOP SPORTS CO. LTD.
    Inventors: Hironori TAKIHARA, Takahiro SAJIMA, Kohei MIMURA
  • Golf club shaft
    Patent number: 9993705
    Abstract: To provide a golf club shaft that can provide a moderate rigidity and enhance an impact strength. A shaft 6 includes full length layers s3, s4, s7, s8 and s9 provided wholly in a longitudinal direction of the shaft, and tip end partial layers s1, s2, s10, s11 and s12 provided on a tip end part of the shaft. The full length layers include bias layers s3 and s4 and straight layers s8 and s9. The tip end partial layer includes an inner glass fiber reinforced layer s1, and an outer low elastic carbon fiber reinforced layer s10 or an outer glass fiber reinforced layer s10 which is disposed outside the inner glass fiber reinforced layer s1. The low elastic carbon fiber has a tensile elastic modulus of 22 ton/mm2 or less. In the shaft 6, a shaft weight in terms of 46 inches is 55 g or less.
    Type: Grant
    Filed: December 1, 2016
    Date of Patent: June 12, 2018
    Assignee: DUNLOP SPORTS CO., LTD.
    Inventor: Tatsuya Yashiki
  • GOLF BALL
    Publication number: 20180147451
    Abstract: A golf ball 2 includes a main body 4 and a paint layer 6 positioned outside the main body 4. The main body 4 includes a spherical core 8, a mid layer 10 positioned outside the core 8, and a cover 12 positioned outside the mid layer 10. An indentation depth, measured when the paint layer 6 in a cross-section along a plane passing through a central point of the golf ball 2 is pressed by a force of 30 mgf in a direction perpendicular to the cross-section, is not less than 300 nm and not greater than 3000 nm. The paint layer 6 preferably has a thickness of not less than 5 ?m and not greater than 50 ?m.
    Type: Application
    Filed: October 17, 2017
    Publication date: May 31, 2018
    Applicant: DUNLOP SPORTS CO. LTD.
    Inventors: Kazuya KAMINO, Hidetaka INOUE, Toshiyuki TARAO
  • METHOD OF EVALUATING STABILITY OF GOLF SWING
    Publication number: 20180147447
    Abstract: Provided is a method of evaluating stability of a golf swing. The method comprises calculating a force indicator that represents a force that acts on a body of a golfer during the golf swing and evaluating stability of the golf swing according to a magnitude of the force indicator. In the calculating, the force indicator may be calculated during the golf swing made with a specific golf club, and in the evaluating, the stability of the golf swing may be evaluated as a characteristic of the specific golf club, in accordance with the magnitude of the force indicator.
    Type: Application
    Filed: November 29, 2017
    Publication date: May 31, 2018
    Applicant: DUNLOP SPORTS CO. LTD.
    Inventors: Wataru KIMIZUKA, Masahide ONUKI, Hiroshi HASEGAWA
  • Golf club head and manufacturing method for same
    Patent number: 9981164
    Abstract: The present invention provides a golf club head that enables increasing the moment of inertia while also improving durability, and a manufacturing method for the same. The golf club head of the present invention includes a crown portion. The crown portion has a first region having a first thickness and multiple second regions having a second thickness that is smaller than the first thickness. The second regions are distributed in a radiating fashion so as to extend from an origin toward a peripheral portion of the crown portion excluding the face side, the origin being located within 15 mm of the center of gravity of the golf club head in the toe-heel direction and also being located in the vicinity of the face side in the face-back direction in a plan view.
    Type: Grant
    Filed: July 25, 2016
    Date of Patent: May 29, 2018
    Assignee: DUNLOP SPORTS CO. LTD.
    Inventor: Akio Yamamoto
  • Golf club head
    Patent number: 9981162
    Abstract: Provided is a golf club head capable of realizing a lower center of gravity without a weight member protruding from a sole portion. The golf club head according to the present invention includes a crown portion, a face portion, and a sole portion having at least one recessed portion. The recessed portion is configured to house the weight member such that the weight member does not protrude externally. The sole portion is provided with a raised portion including the recessed portion and protruding downward, and to be at least partially placed on a placement surface in a reference state. A center of the recessed portion is arranged further to a back side in a face-back direction and to a heel side in a toe-heel direction than a center of gravity of the head.
    Type: Grant
    Filed: June 8, 2016
    Date of Patent: May 29, 2018
    Assignee: DUNLOP SPORTS CO. LTD.
    Inventors: Hiroshi Abe, Daisuke Kohno
  • Golf club head
    Patent number: 9981166
    Abstract: A wood-type golf club head includes a main body and a striking wall associated with the main body. The striking wall has a striking face including a face center, a first imaginary plane tangent to the face center, and a rear surface opposite the striking face. In a second imaginary plane perpendicular to the first imaginary plane and passing through the face center, the striking face includes a first point associated with a maximum thickness, tmax, of the striking wall, and a second point associated with a minimum thickness, tmin, of the striking wall, such that a ratio, tmax/tmin, is no less than 1.70. Also, in the second imaginary plane, the striking wall gradually tapers in thickness entirely from the first point to the second point.
    Type: Grant
    Filed: December 20, 2016
    Date of Patent: May 29, 2018
    Assignee: DUNLOP SPORTS CO. LTD.
    Inventors: Mitchell Samson, Alex L. Timmons
  • GOLF BALL
    Publication number: 20180140904
    Abstract: An object of the present invention is to provide a golf ball traveling a great distance on driver shots.
    Type: Application
    Filed: January 18, 2018
    Publication date: May 24, 2018
    Applicant: DUNLOP SPORTS CO. LTD.
    Inventors: Kohei MIMURA, Takahiro SAJIMA, Kosuke TACHIBANA
  • Golf club head
    Patent number: D820368
    Type: Grant
    Filed: October 5, 2016
    Date of Patent: June 12, 2018
    Assignee: DUNLOP SPORTS CO. LTD.
    Inventor: Patrick A. Ripp
  • Golf club head
    Patent number: D820369
    Type: Grant
    Filed: October 5, 2016
    Date of Patent: June 12, 2018
    Assignee: DUNLOP SPORTS CO. LTD.
    Inventor: Patrick A. Ripp
  • Golf club head
    Patent number: D820926
    Type: Grant
    Filed: June 9, 2017
    Date of Patent: June 19, 2018
    Assignee: DUNLOP SPORTS CO. LTD.
    Inventor: Mika Becktor
  • Golf club head
    Patent number: D820927
    Type: Grant
    Filed: June 9, 2017
    Date of Patent: June 19, 2018
    Assignee: DUNLOP SPORTS CO. LTD.
    Inventors: Phillip C. Seagram, Mika Becktor
  • Golf club head
    Patent number: D820931
    Type: Grant
    Filed: October 5, 2016
    Date of Patent: June 19, 2018
    Assignee: DUNLOP SPORTS CO. LTD.
    Inventor: Patrick A. Ripp