Patents by Inventor Yasutaka Enoki

Yasutaka Enoki has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 5720831
    Abstract: A tread of a heavy-duty pneumatic radial tire comprises a pair of upper and lower rubber layers having mutually different moduli of elasticity and a small-width groove formed in the upper rubber layer in such manner as to be substantially continuous in a circumferential direction of the tire. The dimension between a boundary surface bordering the two rubber layers and a bottom of the groove is set to be 1 mm or more. Accordingly, the arrangement prevents the occurrence of cracks due to a deforming stress acting in the groove bottom occurring when the tire rolls or rides on a curbstone.
    Type: Grant
    Filed: March 2, 1992
    Date of Patent: February 24, 1998
    Assignee: Bridgestone Corporation
    Inventors: Yasutoshi Aoki, Yasutaka Enoki
  • Patent number: 5373881
    Abstract: A heavy duty pneumatic tire including in its tread at least one circumferential main groove and shoulder rib grooves spaced from the circumferential main groove and arranged in the proximity of tread ends to define shoulder rib grooves. The shoulder rib grooves are formed to fulfill relationships of Rw/W=0.28-0.42, Rs/W=0.05-0.12 and Rd/W=0.07-0.19, where a distance from an equatorial plane to the tread end of the tire is W mm, a distance from the tread end to the shoulder rib groove is Rw mm, a width of the shoulder rib groove is Rs mm and a depth of the shoulder rib groove is Rd mm. Angles .alpha. and .beta. made by normal lines to surfaces of the tread and opposite walls of the shoulder rib grooves are in relations -7.degree..ltoreq..alpha. and .beta..ltoreq.7.degree., respectively.
    Type: Grant
    Filed: April 13, 1990
    Date of Patent: December 20, 1994
    Assignee: Bridgestone Corporation
    Inventor: Yasutaka Enoki
  • Patent number: 5160385
    Abstract: In a heavy duty pneumatic tire, a protrusion is disposed in an intersect portion between circumferential groove and transverse groove in a tread of block pattern, whereby stone capturing is prevented. Furthermore, blind sipe is formed in each block of at least center and second block rows, whereby heel and toe wear as well as shoulder wear are prevented.
    Type: Grant
    Filed: August 6, 1990
    Date of Patent: November 3, 1992
    Assignee: Bridgestone Corporation
    Inventors: Akihito Goto, Yasutaka Enoki
  • Patent number: 4995437
    Abstract: The uneven wear produced in the tread side rib in the heavy duty pneumatic radial tire is prevented by arranging a peripheral fine groove on a particular region of the side face of the tread portion in a particular form.
    Type: Grant
    Filed: November 25, 1988
    Date of Patent: February 26, 1991
    Assignee: Bridgestone Corporation
    Inventors: Yasutaka Enoki, Shigeo Makino, Shinji Murase
  • Patent number: 4289183
    Abstract: A noiseless lug tire which runs at a high speed under a heavy load and which satisfies the following conditions.(1) A ratio Wg/Wl is equal to or smaller than 1.0.(2) Each transverse groove for delimiting lugs is not inclined toward an opening of the transverse groove at the kickout side of each lug.(3) Each transverse groove is inclined toward the opening at the stepin side of each lug at an angle of at most 22.degree..(4) Each portion of a center line of the transverse groove in a substantially total region of a length L of the transverse groove is inclined with respect to the meridian line of the tire at an angle within a range from at most 15.degree. measured in a direction opposite to the inclination direction of the transverse groove as a whole to at most 60.degree. measured in the same direction as the inclination direction of the transverse groove as a whole.
    Type: Grant
    Filed: December 27, 1979
    Date of Patent: September 15, 1981
    Assignee: Bridgestone Tire Company Limited
    Inventors: Masaru Abe, Yoshihiro Sakai, Yasutaka Enoki, Noriyasu Sawada
  • Patent number: D308954
    Type: Grant
    Filed: December 22, 1987
    Date of Patent: July 3, 1990
    Assignee: Bridgestone Corporation
    Inventor: Yasutaka Enoki
  • Patent number: D313383
    Type: Grant
    Filed: October 26, 1988
    Date of Patent: January 1, 1991
    Assignee: Bridgestone Corporation
    Inventor: Yasutaka Enoki
  • Patent number: D316065
    Type: Grant
    Filed: February 28, 1989
    Date of Patent: April 9, 1991
    Assignee: Bridgestone Corp.
    Inventors: Toru Tsuda, Yasutaka Enoki, Tetsuhito Tsukagoshi
  • Patent number: D317427
    Type: Grant
    Filed: October 4, 1988
    Date of Patent: June 11, 1991
    Assignee: Bridgestone Corporation
    Inventors: Yasutaka Enoki, Shigeo Makino, Yasutoshi Aoki
  • Patent number: D317737
    Type: Grant
    Filed: October 4, 1988
    Date of Patent: June 25, 1991
    Assignee: Bridgestone Corporation
    Inventors: Yasutaka Enoki, Shigeo Makino, Yasutoshi Aoki
  • Patent number: D318035
    Type: Grant
    Filed: October 4, 1988
    Date of Patent: July 9, 1991
    Assignee: Bridgestone Corporation
    Inventors: Yasutaka Enoki, Shigeo Makino, Yasutoshi Aoki
  • Patent number: D326071
    Type: Grant
    Filed: December 8, 1989
    Date of Patent: May 12, 1992
    Assignee: Bridgestone Corporation
    Inventors: Yasutaka Enoki, Akihito Goto