Patents by Inventor Shinsaku Katayama

Shinsaku Katayama 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: 10987976
    Abstract: By forming a ground contact edge side of lug grooves such that the groove depth becomes shallower in groove depth from the tire equatorial plane side toward the ground contact edge, and by setting an average angle of inclination formed between a tread face and a groove bottom to be not more than 5°, water expulsion is performed smoothly in the vicinity of the ground contact edge while securing the rigidity of land portions in the vicinity of the ground contact edge. This enables a high degree of both wet performance and dry performance to be achieved.
    Type: Grant
    Filed: April 19, 2016
    Date of Patent: April 27, 2021
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Takayuki Kurata, Shinsaku Katayama, Masakazu Amano
  • Patent number: 10507696
    Abstract: A pneumatic tire, having a plurality of sipes formed in land portions of a tread thereof so as to each extend in the tire width direction, characterized in that: in a cross section of the land portion orthogonal to the sipe extending direction, provided that an imaginary sipe main line links two ends in the tire radial direction of each sipe, at least two of the sipes are “inclined sipes” each having the sipe main line inclined with respect to the tire radial direction; each inclined sipe has inner bent portions each protruding with respect to the sipe main line with peaks positioned deeper than 20% of the sipe depth; and the sipe main line(s) of at least one of the inclined sipes are inclined in a direction opposite, with respect to the tire radial direction, to the sipe main line of any of the other inclined sipes.
    Type: Grant
    Filed: October 23, 2013
    Date of Patent: December 17, 2019
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Yoshio Kaji, Shinsaku Katayama, Eisuke Seta, Takayuki Kurata
  • Publication number: 20190248183
    Abstract: Provided is a pneumatic tire having at least one carcass layer as a skeleton extending in toroidal shape over a pair of bead portions, at least one belt layer and a tread disposed on an outer side in the radial direction of a crown portion of the carcass. In a tire section in the widthwise direction in state where the tire is assembled to an application rim, ratio BD/BW of radius difference BD between radius at a center portion and radius at an end portion in the widthwise direction of an innermost layer of the belt layer, to width BW of the innermost layer, ranges from 0.01 to 0.04, and ratio TD/TW of radius difference TD between radius at a center portion and radius at an end portion of the tread in the widthwise direction of a tread ground surface, to tread ground-contact width TW, satisfies BD/BW<TD/TW.
    Type: Application
    Filed: April 22, 2019
    Publication date: August 15, 2019
    Applicant: BRIDGESTONE CORPORATION
    Inventor: Shinsaku Katayama
  • Publication number: 20190100059
    Abstract: The projection portion 150 includes a straight portion 152 extended linearly in a predetermined direction, a first inclined portion 151 inclined to spread toward an outer side in the predetermined direction from one end of the straight portion 152, and a second inclined portion 153 inclined to spread toward an outer side in the predetermined direction from another end of the straight portion 152. A period defined by a length of the projection portion 150 in the predetermined direction is 0.8 times to 2.0 times as large as a sipe depth defined by a length of the sipe 100A between the wheel tread of a block 20A and a bottom of the sipe 100A.
    Type: Application
    Filed: March 16, 2017
    Publication date: April 4, 2019
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Yoshio KAJI, Ryunosuke MATSUYAMA, Shinsaku KATAYAMA
  • Patent number: 10245889
    Abstract: A pneumatic tire (10), which has, in the surface of the tread (11), lug grooves (15) on one side extending from one axial edge towards the axial center of the tire in such a manner as to intersect with the circumferential direction of the tire and lug grooves (15) on the other side extending in a symmetrically opposite direction from the axial center towards the other axial edge of the tire, has at least one circumferential groove (12) extending circumferentially around the tire. Also, circumferential grooves (12, 13a, 13b) are so formed as to satisfy a relationship of “1?(S/L)?3” where L is the axial length of the central region, which is the region enclosed by two straight parallel lines each passing through the center between the contact width center (CL) and the contact edge with the shoulder regions being the regions axially outside of the parallel lines, and S is the total of the groove areas of the circumferential grooves (12, 13a, 13b) disposed in the central region.
    Type: Grant
    Filed: November 28, 2013
    Date of Patent: April 2, 2019
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Shinsaku Katayama, Eisuke Seta, Yoshio Kaji, Masafumi Koide, Takayuki Kurata, Hiroyuki Katsuno, Masakazu Amano, Ataka Takei
  • Publication number: 20180126794
    Abstract: By forming a ground contact edge side of lug grooves such that the groove depth becomes shallower in groove depth from the tire equatorial plane side toward the ground contact edge, and by setting an average angle of inclination formed between a tread face and a groove bottom to be not more than 5°, water expulsion is performed smoothly in the vicinity of the ground contact edge while securing the rigidity of land portions in the vicinity of the ground contact edge. This enables a high degree of both wet performance and dry performance to be achieved.
    Type: Application
    Filed: April 19, 2016
    Publication date: May 10, 2018
    Inventors: Takayuki KURATA, Shinsaku KATAYAMA, Masakazu AMANO
  • Patent number: 9802444
    Abstract: A pneumatic tire (10) has, in the surface of the tread (11), a central circumferential groove (12) located at the center of the contact patch width and extending circumferentially around the tire, a plurality of longitudinal grooves (13 (13a, 13b)) formed on the axially outside of the central circumferential groove (12), lug grooves (15), and blocks (16 (16a to 16c)) defined by the central circumferential groove (12), the longitudinal grooves (13), and the lug grooves (15). Each of the lug grooves (15) is formed such that its width in the shoulder region is greater than its width in the central region, and the sum of the groove area of the central circumferential groove (12) and the groove area of the longitudinal grooves (13) is smaller than the area of the lug grooves (15).
    Type: Grant
    Filed: November 28, 2013
    Date of Patent: October 31, 2017
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Shinsaku Katayama, Eisuke Seta, Yoshio Kaji, Masafumi Koide, Takayuki Kurata, Hiroyuki Katsuno, Masakazu Amano, Ataka Takei
  • Patent number: 9688105
    Abstract: A pneumatic tire, comprising: a tread surface; a plurality of grooves formed in the tread surface, including a plurality of widthwise grooves each extending from a corresponding tread end on the inner side in the tread width direction and a plurality of circumferential grooves each extending in the tread circumferential direction to intersect the widthwise grooves; blocks demarcated by the plurality of grooves; and a chamfered portion formed at a corner, on the trailing edge side and on the outer side in the tread width direction, of each block.
    Type: Grant
    Filed: October 25, 2013
    Date of Patent: June 27, 2017
    Assignee: BRIDGESTONE CORPORATION
    Inventors: Hiroyuki Katsuno, Satoshi Ishikawa, Shinsaku Katayama, Eisuke Seta, Yoshio Kaji, Takayuki Kurata
  • Publication number: 20170120684
    Abstract: A tire having V-shaped lug grooves displays both improved grip performance on snow and anti-hydroplaning performance. To that end, an absolute value of difference between a lug groove diagonal angle (?LG), which is an angle of diagonal lug grooves (13) in a tread (11) surface with respect to a tire axial direction, and a profile line diagonal angle (?FP), which is an angle of a normal line of a leading-end profile line of a contact patch shape of the tire (10) with respect to the tire axial direction, is set to 0° or more and 60° or less at respective positions in the tire axial direction.
    Type: Application
    Filed: May 25, 2015
    Publication date: May 4, 2017
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Shinsaku KATAYAMA, Yoshio KAJI, Takayuki KURATA
  • Publication number: 20150321518
    Abstract: A pneumatic tire (10) has, in the surface of the tread (11), a central circumferential groove (12) located at the center of the contact patch width and extending circumferentially around the tire, a plurality of longitudinal grooves (13 (13a, 13b)) formed on the axially outside of the central circumferential groove (12), lug grooves (15), and blocks (16 (16a to 16c)) defined by the central circumferential groove (12), the longitudinal grooves (13), and the lug grooves (15). Each of the lug grooves (15) is formed such that its width in the shoulder region is greater than its width in the central region, and the sum of the groove area of the central circumferential groove (12) and the groove area of the longitudinal grooves (13) is smaller than the area of the lug grooves (15).
    Type: Application
    Filed: November 28, 2013
    Publication date: November 12, 2015
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Shinsaku KATAYAMA, Eisuke SETA, Yoshio KAJI, Masafumi KOIDE, Takayuki KURATA, Hiroyuki KATSUNO, Masakazu AMANO, Ataka TAKEI
  • Publication number: 20150298506
    Abstract: A pneumatic tire (10), which has, in the surface of the tread (11), lug grooves (15) on one side extending from one axial edge towards the axial center of the tire in such a manner as to intersect with the circumferential direction of the tire and lug grooves (15) on the other side extending in a symmetrically opposite direction from the axial center towards the other axial edge of the tire, has at least one circumferential groove (12) extending circumferentially around the tire. Also, circumferential grooves (12, 13a, 13b) are so formed as to satisfy a relationship of “1?(S/L)?3” where L is the axial length of the central region, which is the region enclosed by two straight parallel lines each passing through the center between the contact width center (CL) and the contact edge with the shoulder regions being the regions axially outside of the parallel lines, and S is the total of the groove areas of the circumferential grooves (12, 13a, 13b) disposed in the central region.
    Type: Application
    Filed: November 28, 2013
    Publication date: October 22, 2015
    Inventors: Shinsaku KATAYAMA, Eisuke SETA, Yoshio KAJI, Masafumi KOIDE, Takayuki KURATA, Hiroyuki KATSUNO, Masakazu AMANO, Ataka TAKEI
  • Publication number: 20150290978
    Abstract: A pneumatic tire, comprising: a tread surface; a plurality of grooves formed in the tread surface, including a plurality of widthwise grooves each extending from a corresponding tread end on the inner side in the tread width direction and a plurality of circumferential grooves each extending in the tread circumferential direction to intersect the widthwise grooves; blocks demarcated by the plurality of grooves; and a chamfered portion formed at a corner, on the trailing edge side and on the outer side in the tread width direction, of each block.
    Type: Application
    Filed: October 25, 2013
    Publication date: October 15, 2015
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Hiroyuki Katsuno, Satoshi Ishikawa, Shinsaku Katayama, Eisuke Seta, Yoshio Kaji, Takayuki Kurata
  • Publication number: 20150266346
    Abstract: A pneumatic tire, having a plurality of sipes formed in land portions of a tread thereof so as to each extend in the tire width direction, characterized in that: in a cross section of the land portion orthogonal to the sipe extending direction, provided that an imaginary sipe main line links two ends in the tire radial direction of each sipe, at least two of the sipes are “inclined sipes” each having the sipe main line inclined with respect to the tire radial direction; each inclined sipe has inner bent portions each protruding with respect to the sipe main line with peaks positioned deeper than 20% of the sipe depth; and the sipe main line(s) of at least one of the inclined sipes are inclined in a direction opposite, with respect to the tire radial direction, to the sipe main line of any of the other inclined sipes.
    Type: Application
    Filed: October 23, 2013
    Publication date: September 24, 2015
    Applicant: BRIDGESTONE CORPORATION
    Inventors: Yoshio Kaji, Shinsaku Katayama, Eisuke Seta, Takayuki Kurata
  • Patent number: 8881783
    Abstract: There is provided a pneumatic tire having excellent uneven wear resistance performance, low rolling resistance and durability of side portion's appearance. The pneumatic tire comprises a carcass as a framework consisting of at least one carcass ply troidally extending between bead portions embedded with a pair of bead cores and turned around the bead cores from an inner side to an outer side in a tire width direction, a belt comprising at least one inclined belt layer and a tread successively disposed on a radially outer side of a crown portion of the carcass, wherein a ratio BD/BW is in a range between 0.01 and 0.
    Type: Grant
    Filed: September 30, 2010
    Date of Patent: November 11, 2014
    Assignee: Bridgestone Corporation
    Inventor: Shinsaku Katayama
  • Patent number: 8794285
    Abstract: A pneumatic tire for motorcycle is provided which can improve the traction performance especially during sharp cornering by largely leaning a vehicle (motorbike) followed by acceleration, and the stability during leaning of a vehicle in addition to enhancing steering stability at high speed. A pneumatic tire for motorcycle having a tread portion 11 formed in a circular shape, the tread portion 11 having a crown portion which has a spiral belt layer 3 in its inside in the radial direction of the tire, the spiral belt layer having an angle of 0 to 5° with respect to the circumferential direction of the tire and an arrangement width 0.5 to 0.
    Type: Grant
    Filed: November 20, 2009
    Date of Patent: August 5, 2014
    Assignee: Bridgestone Corporation
    Inventor: Shinsaku Katayama
  • Publication number: 20140138002
    Abstract: Provided is a pneumatic tire having at least one carcass layer as a skeleton extending in toroidal shape over a pair of bead portions, at least one belt layer and a tread disposed on an outer side in the radial direction of a crown portion of the carcass. In a tire section in the widthwise direction in state where the tire is assembled to an application rim, ratio BD/BW of radius difference BD between radius at a center portion and radius at an end portion in the widthwise direction of an innermost layer of the belt layer, to width BW of the innermost layer, ranges from 0.01 to 0.04, and ratio TD/TW of radius difference TD between radius at a center portion and radius at an end portion of the tread in the widthwise direction of a tread ground surface, to tread ground-contact width TW, satisfies BD/BW<TD/TW.
    Type: Application
    Filed: May 17, 2012
    Publication date: May 22, 2014
    Applicant: BRIDGESTONE CORPORATION
    Inventor: Shinsaku Katayama
  • Patent number: 8272413
    Abstract: The present invention aims to provide a pneumatic tire for a motorcycle capable of improving turning performance on a wet road surface as compared to that of conventional tires. The pneumatic tire for a motorcycle comprises a tread 28 consisting of a tread central portion having a width of 60% of a tread developed width and tread side portions located outside of the tread central portion in the width direction of the tire and a plurality of wide inclined grooves 42 and narrow inclined grooves 44 inclined at an angle of less than 90 degrees with respect to the circumferential direction of the tire formed in the tread side portion such that the grooves continuously extend over a region of 50% or more of a width of the tread side portion. A groove width of the narrow inclined grooves 44 is set within a range between 0.3 mm and 2.5 mm. A total area of the wide inclined grooves 42 is set to not more than 20% of an area of the tread side portion.
    Type: Grant
    Filed: August 24, 2006
    Date of Patent: September 25, 2012
    Assignee: Bridgestone Corporation
    Inventors: Makoto Ishiyama, Hiroyuki Matsumoto, Shinsaku Katayama
  • Publication number: 20120193008
    Abstract: There is provided a pneumatic tire having excellent uneven wear resistance performance, low rolling resistance and durability of side portion's appearance. The pneumatic tire comprises a carcass as a framework consisting of at least one carcass ply troidally extending between bead portions embedded with a pair of bead cores and turned around the bead cores from an inner side to an outer side in a tire width direction, a belt comprising at least one inclined belt layer and a tread successively disposed on a radially outer side of a crown portion of the carcass, wherein a ratio BD/BW is in a range between 0.01 and 0.
    Type: Application
    Filed: September 30, 2010
    Publication date: August 2, 2012
    Applicant: BRIDGESTONE CORPORATION
    Inventor: Shinsaku Katayama
  • Patent number: D722556
    Type: Grant
    Filed: May 10, 2013
    Date of Patent: February 17, 2015
    Assignee: Bridgestone Corporation
    Inventors: Ataka Takei, Hiroyuki Katsuno, Satoshi Ishikawa, Yoshikage Sato, Koichi Ota, Shinsaku Katayama, Eisuke Seta, Yoshio Kaji, Masafumi Koide, Takayuki Kurata, Masakazu Amano
  • Patent number: D722557
    Type: Grant
    Filed: May 10, 2013
    Date of Patent: February 17, 2015
    Assignee: Bridgestone Corporation
    Inventors: Ataka Takei, Hiroyuki Katsuno, Yoshikage Sato, Satoshi Ishikawa, Masakazu Amano, Koichi Ota, Eisuke Seta, Yoshio Kaji, Shinsaku Katayama, Masafumi Koide, Takayuki Kurata