Patents by Inventor Koichi Kotoku

Koichi Kotoku 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: 10183531
    Abstract: In a pneumatic tire, a belt layer is formed by laminating a pair of cross belts having a belt angle, as an absolute value, of not less than 10° and not greater than 45° and having belt angles of mutually opposite signs, and a circumferential reinforcing layer having a belt angle within a range of ±5° with respect to the tire circumferential direction. Moreover, the distance (Gcc) from the tread profile to the tire inner circumferential surface along the tire equatorial plane and the distance (Gsh) from the tread edge to the tire inner circumferential surface have a relationship satisfying 1.10?Gsh/Gcc.
    Type: Grant
    Filed: October 10, 2012
    Date of Patent: January 22, 2019
    Assignee: The Yokohama Rubber Co., LTD.
    Inventor: Koichi Kotoku
  • Patent number: 9950570
    Abstract: A pneumatic tire includes at least three circumferential main grooves that extend in the tire circumferential direction, and land portions that are partitioned and formed by these circumferential main grooves. In addition, a belt layer is formed by laminating a pair of cross belts each having a belt angle of not less than 10° and not more than 45° as an absolute value and having mutually opposite signs, and a circumferential reinforcing layer having a belt angle within a range of ±5° with respect to the tire circumferential direction. In addition, in a cross-sectional view taken along the tire meridian direction, a diameter D1 at a point at an edge portion on the inner side of a shoulder land portion in the tire width direction and a diameter D2 at a predetermined point within the ground-contact surface of the shoulder land portion have a relationship such that D2<D1.
    Type: Grant
    Filed: December 28, 2012
    Date of Patent: April 24, 2018
    Assignee: The Yokohama Rubber Co., LTD.
    Inventor: Koichi Kotoku
  • Patent number: 9849730
    Abstract: A pneumatic tire includes a carcass layer, a belt layer that is disposed on the outer side in the tire radial direction of the carcass layer, and a tread rubber that is disposed on the outer side in the tire radial direction of the belt layer. The pneumatic tire also includes at least three circumferential main grooves extending in the tire circumferential direction, and a plurality of land portions that are defined by these circumferential main grooves. The belt layer includes an inner-side cross belt and outer-side cross belt having belt angles of not less than 51° and not more than 80° as absolute values with respect to the tire circumferential direction, the belt angles having mutually opposite signs, and a circumferential reinforcing layer having a belt angle that satisfies a range of ±5° with respect to the tire circumferential direction.
    Type: Grant
    Filed: June 7, 2013
    Date of Patent: December 26, 2017
    Assignee: The Yokohama Rubber Co., LTD.
    Inventors: Hideki Hamanaka, Koshi Iga, Koichi Kotoku
  • Patent number: 9783003
    Abstract: A pneumatic tire includes an inner-side cross belt and an outer-side cross belt forming belt angles of mutually different signs with the tire circumferential direction with absolute values from 46° to 80°, inclusive; a circumferential reinforcing layer arranged between the inner-side cross belt and the outer-side cross belt and forming a belt angle of ±5° with the tire circumferential direction; and a supplemental belt arranged outside the outer-side cross belt in the radial direction of the tire and forming a belt angle with the tire circumferential direction with an absolute value between 10° and 45° inclusive.
    Type: Grant
    Filed: June 7, 2013
    Date of Patent: October 10, 2017
    Assignee: The Yokohama Rubber Co., LTD.
    Inventors: Koichi Kotoku, Koshi Iga, Hideki Hamanaka
  • Patent number: 9604502
    Abstract: In a pneumatic tire, a belt layer includes an inner-side cross belt and an outer-side cross belt having an absolute value of belt angle with respect to a tire circumferential direction of not less than 46 degrees and not more than 80 degrees and having belt angles with signs that are opposite to each other; and a circumferential reinforcing layer having a belt angle with respect to the tire circumferential direction within the range of ±5 degrees and disposed between the inner-side cross belt and outer-side cross belt. Also, a distance Gcc on a tire equatorial plane from a tread profile to a tire inner circumferential surface and a distance Gsh from a tread edge to the tire inner circumferential surface satisfy a relationship 1.10?Gsh/Gcc.
    Type: Grant
    Filed: June 7, 2013
    Date of Patent: March 28, 2017
    Assignee: The Yokohama Rubber Co., LTD.
    Inventors: Tsuyoshi Kunugi, Koshi Iga, Hideki Hamanaka, Koichi Kotoku
  • Patent number: 9604503
    Abstract: A belt layer of a pneumatic tire includes an inner-side cross belt and an outer-side cross belt forming belt angles of mutually different signs with the tire circumferential direction with absolute values from 46° to 80°, inclusive; a circumferential reinforcing layer arranged between the inner-side cross belt and the outer-side cross belt and forming a belt angle of within ±5° with the tire circumferential direction; and a supplemental belt arranged inside of the inner-side cross belt in the radial direction of the tire and forming a belt angle with the tire circumferential direction with an absolute value from 10° to 45°, inclusive.
    Type: Grant
    Filed: June 7, 2013
    Date of Patent: March 28, 2017
    Assignee: The Yokohama Rubber Co., LTD.
    Inventors: Koshi Iga, Hideki Hamanaka, Koichi Kotoku
  • Patent number: 9259971
    Abstract: In a pneumatic tire, a belt layer includes an inner-side cross belt and outer-side cross belt having belt angles of not less than 46° and not more than 80° as absolute values with respect to a tire circumferential direction, the belt angles having mutually opposite signs, a circumferential reinforcing layer having a belt angle satisfying a range of ±5° with respect to the tire circumferential direction, and disposed between the inner-side cross belt and outer-side cross belt, and a supplemental belt having a belt angle of not less than 10° and not more than 45° as an absolute value with respect to the tire circumferential direction, and disposed on the outer side in a tire radial direction of the outer-side cross belt. Additionally, the supplemental belt and the outer-side cross belt have belt angles of mutually opposite signs.
    Type: Grant
    Filed: June 7, 2013
    Date of Patent: February 16, 2016
    Assignee: The Yokohama Rubber Co., LTD.
    Inventors: Hideki Hamanaka, Koshi Iga, Koichi Kotoku
  • Publication number: 20150321515
    Abstract: A pneumatic tire includes at least three circumferential main grooves that extend in the tire circumferential direction, and land portions that are partitioned and formed by these circumferential main grooves. In addition, a belt layer is formed by laminating a pair of cross belts each having a belt angle of not less than 10° and not more than 45° as an absolute value and having mutually opposite signs, and a circumferential reinforcing layer having a belt angle within a range of ±5° with respect to the tire circumferential direction. In addition, in a cross-sectional view taken along the tire meridian direction, a diameter D1 at a point at an edge portion on the inner side of a shoulder land portion in the tire width direction and a diameter D2 at a predetermined point within the ground-contact surface of the shoulder land portion have a relationship such that D2<D1.
    Type: Application
    Filed: December 28, 2012
    Publication date: November 12, 2015
    Applicant: The Yokohama Rubber Co., LTD.
    Inventor: Koichi Kotoku
  • Publication number: 20150273943
    Abstract: In a pneumatic tire, a belt layer is formed by laminating a pair of cross belts having a belt angle, as an absolute value, of not less than 10° and not greater than 45° and having belt angles of mutually opposite signs, and a circumferential reinforcing layer having a belt angle within a range of ±5° with respect to the tire circumferential direction. Moreover, the distance (Gcc) from the tread profile to the tire inner circumferential surface along the tire equatorial plane and the distance (Gsh) from the tread edge to the tire inner circumferential surface have a relationship satisfying 1.10?Gsh/Gcc.
    Type: Application
    Filed: October 10, 2012
    Publication date: October 1, 2015
    Inventor: Koichi Kotoku
  • Publication number: 20150165823
    Abstract: A belt layer of a pneumatic tire includes an inner-side cross belt and an outer-side cross belt forming belt angles of mutually different signs with the tire circumferential direction with absolute values from 46° to 80°, inclusive; a circumferential reinforcing layer arranged between the inner-side cross belt and the outer-side cross belt and forming a belt angle of within ±5° with the tire circumferential direction; and a supplemental belt arranged inside of the inner-side cross belt in the radial direction of the tire and forming a belt angle with the tire circumferential direction with an absolute value from 10° to 45°, inclusive.
    Type: Application
    Filed: June 7, 2013
    Publication date: June 18, 2015
    Inventors: Koshi Iga, Hideki Hamanaka, Koichi Kotoku
  • Publication number: 20150151582
    Abstract: In a pneumatic tire, a belt layer includes an inner-side cross belt and outer-side cross belt having belt angles of not less than 46° and not more than 80° as absolute values with respect to a tire circumferential direction, the belt angles having mutually opposite signs, a circumferential reinforcing layer having a belt angle satisfying a range of ±5° with respect to the tire circumferential direction, and disposed between the inner-side cross belt and outer-side cross belt, and a supplemental belt having a belt angle of not less than 10° and not more than 45° as an absolute value with respect to the tire circumferential direction, and disposed on the outer side in a tire radial direction of the outer-side cross belt. Additionally, the supplemental belt and the outer-side cross belt have belt angles of mutually opposite signs.
    Type: Application
    Filed: June 7, 2013
    Publication date: June 4, 2015
    Inventors: Hideki Hamanaka, Koshi Iga, Koichi Kotoku
  • Publication number: 20150151581
    Abstract: In a pneumatic tire, a belt layer includes an inner-side cross belt and an outer-side cross belt having an absolute value of belt angle with respect to a tire circumferential direction of not less than 46 degrees and not more than 80 degrees and having belt angles with signs that are opposite to each other; and a circumferential reinforcing layer having a belt angle with respect to the tire circumferential direction within the range of ±5 degrees and disposed between the inner-side cross belt and outer-side cross belt. Also, a distance Gcc on a tire equatorial plane from a tread profile to a tire inner circumferential surface and a distance Gsh from a tread edge to the tire inner circumferential surface satisfy a relationship 1.10?Gsh/Gcc.
    Type: Application
    Filed: June 7, 2013
    Publication date: June 4, 2015
    Inventors: Tsuyoshi Kunugi, Koshi Iga, Hideki Hamanaka, Koichi Kotoku
  • Publication number: 20150136296
    Abstract: A pneumatic tire includes an inner-side cross belt and an outer-side cross belt forming belt angles of mutually different signs with the tire circumferential direction with absolute values from 46° to 80°, inclusive; a circumferential reinforcing layer arranged between the inner-side cross belt and the outer-side cross belt and forming a belt angle of ±5° with the tire circumferential direction; and a supplemental belt arranged outside the outer-side cross belt in the radial direction of the tire and forming a belt angle with the tire circumferential direction with an absolute value between 10° and 45° inclusive.
    Type: Application
    Filed: June 7, 2013
    Publication date: May 21, 2015
    Applicant: The Yokohama Rubber Co., LTD.
    Inventors: Koichi Kotoku, Koshi Iga, Hideki Hamanaka
  • Publication number: 20140326380
    Abstract: The pneumatic tire includes a carcass layer and a belt layer that is formed by laminating a pair of cross belts and a circumferential reinforcing layer and that is disposed outward in a tire radial direction from the carcass layer. Additionally, the pneumatic tire includes a plurality of circumferential main grooves extending in a tire circumferential direction, and a plurality of land portions partitioned by the circumferential main grooves in a tread portion. Also, an end portion on the outer side in the tire width direction of the circumferential reinforcing layer is on the outer side in the tire width direction of a normal line m that is drawn from a point P at an edge portion on the inner side in a tire width direction of a shoulder land portion to the carcass layer.
    Type: Application
    Filed: September 22, 2011
    Publication date: November 6, 2014
    Applicant: The Yokohama Rubber Co., LTD.
    Inventor: Koichi Kotoku
  • Patent number: 8361255
    Abstract: A copper alloy material having: 1.0 to 5.0 mass % of Ni; 0.2 to 1.0 mass % of Si; 1.0 to 5.0 mass % of Zn; 0.1 to 0.5 mass % of Sn; 0.003 to 0.3 mass % of P; and the balance consisting of Cu and an unavoidable impurity. The mass ratio between Ni and each of Si, Zn and Sn is to be Ni/Si=4 to 6, Zn/Ni=0.5 or more, and Sn/Ni=0.05 to 0.2.
    Type: Grant
    Filed: October 22, 2009
    Date of Patent: January 29, 2013
    Assignee: Hitachi Cable, Ltd.
    Inventors: Hiroaki Takano, Yoshiki Yamamoto, Koichi Kotoku, Chingping Tong
  • Publication number: 20100037996
    Abstract: A copper alloy material having: 1.0 to 5.0 mass % of Ni; 0.2 to 1.0 mass % of Si; 1.0 to 5.0 mass % of Zn; 0.1 to 0.5 mass % of Sn; 0.003 to 0.3 mass % of P; and the balance consisting of Cu and an unavoidable impurity. The mass ratio between Ni and each of Si, Zn and Sn is to be Ni/Si=4 to 6, Zn/Ni=0.5 or more, and Sn/Ni=0.05 to 0.2.
    Type: Application
    Filed: October 22, 2009
    Publication date: February 18, 2010
    Inventors: Hiroaki TAKANO, Yoshiki Yamamoto, Koichi Kotoku, Chingping Tong
  • Publication number: 20070051441
    Abstract: A copper alloy material having: 1.0 to 5.0 mass % of Ni; 0.2 to 1.0 mass % of Si; 1.0 to 5.0 mass % of Zn; 0.1 to 0.5 mass % of Sn; 0.003 to 0.3 mass % of P; and the balance consisting of Cu and an unavoidable impurity. The mass ratio between Ni and each of Si, Zn and Sn is to be Ni/Si=4 to 6, Zn/Ni=0.5 or more, and Sn/Ni=0.05 to 0.2.
    Type: Application
    Filed: August 28, 2006
    Publication date: March 8, 2007
    Inventors: Hiroaki Takano, Yoshiki Yamamoto, Koichi Kotoku, Chingping Tong
  • Publication number: 20070051442
    Abstract: A copper alloy material for electric parts having: 1.0 to 5.0 mass % of Ni; 0.2 to 1.0 mass % of Si; 0.05 to 2.0 mass % of Sn; 0.1 to 5.0 mass % of Zn; 0.01 to 0.3 mass % of P; 0.05 to 1.0 mass % of at least one of Fe and Co; and the balance consisting of Cu and an unavoidable impurity. The ratio, (Ni+Fe+Co)/(Si+P), between the total mass of Ni, Fe and Co and the total mass of Si and P is 4 or more and 10 or less.
    Type: Application
    Filed: August 28, 2006
    Publication date: March 8, 2007
    Inventors: Yoshiki Yamamoto, Hiroaki Takano, Koichi Kotoku, Chingping Tong, Katsumi Nomura
  • Patent number: D729148
    Type: Grant
    Filed: March 12, 2013
    Date of Patent: May 12, 2015
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventor: Koichi Kotoku
  • Patent number: D851579
    Type: Grant
    Filed: October 18, 2017
    Date of Patent: June 18, 2019
    Assignee: THE YOKOHAMA RUBBER CO., LTD.
    Inventors: Hideki Hamanaka, Koichi Kotoku