Patents by Inventor Riichiro Mama

Riichiro Mama 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).

  • Pneumatic radial tire
    Publication number: 20030145929
    Abstract: A pneumatic tire comprising a rubber member containing a short fiber (A′) formed by the fibrillation of a short fiber (A) whose cross section takes a sea-island structure essentially composed of at least two polymers.
    Type: Application
    Filed: November 19, 2002
    Publication date: August 7, 2003
    Inventors: Daisuke Kanenari, Riichiro Mama, Kazuto Yamakawa, Takeo Masaki, Zenichiro Shida, Junichi Ohtani, Tsuyoshi Kunugi
  • Pneumatic radial tire
    Publication number: 20030145930
    Abstract: A pneumatic tire comprising a rubber member containing a short fiber (A′) formed by the fibrillation of a short fiber (A) whose cross section takes a sea-island structure essentially composed of at least two polymers.
    Type: Application
    Filed: November 19, 2002
    Publication date: August 7, 2003
    Inventors: Daisuke Kanenari, Riichiro Mama, Kazuto Yamakawa, Takeo Masaki, Zenichiro Shida, Junichi Ohtani, Tsuyoshi Kunugi
  • Pneumatic radial tire
    Publication number: 20030136489
    Abstract: A pneumatic tire comprising a rubber member containing a short fiber (A′) formed by the fibrillation of a short fiber (A) whose cross section takes a sea-island structure essentially composed of at least two polymers.
    Type: Application
    Filed: November 19, 2002
    Publication date: July 24, 2003
    Inventors: Daisuke Kanenari, Riichiro Mama, Kazuto Yamakawa, Takeo Masaki, Zenichiro Shida, Junichi Ohtani, Tsuyoshi Kunugi
  • Pneumatic radial tire reinforced with fibrillated sea-island short polymer fibers
    Patent number: 6588470
    Abstract: A pneumatic tire comprising a rubber member containing a short fiber (A′) formed by the fibrillation of a short fiber (A) whose cross section takes a sea-island structure essentially composed of at least two polymers.
    Type: Grant
    Filed: February 1, 2001
    Date of Patent: July 8, 2003
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Daisuke Kanenari, Riichiro Mama, Kazuto Yamakawa
  • Pneumatic radial tire
    Publication number: 20010010245
    Abstract: A pneumatic tire comprising a rubber member containing a short fiber (A′) formed by the fibrillation of a short fiber (A) whose cross section takes a sea-island structure essentially composed of at least two polymers.
    Type: Application
    Filed: February 1, 2001
    Publication date: August 2, 2001
    Applicant: The Yokohama Rubber Co., LTD.
    Inventors: Daisuke Kanenari, Riichiro Mama, Kazuto Yamakawa, Takeo Masaki, Zenichiro Shida, Junichi Ohtani, Tsuyoshi Kunugi
  • Pneumatic radial tire reinforced with fibrillated sea-island short polymer fibers
    Patent number: 6209603
    Abstract: A pneumatic tire comprising a rubber member containing a short fiber (A′) formed by the fibrillation of a short fiber (A) whose cross section takes a sea-island structure essentially composed of at least two polymers.
    Type: Grant
    Filed: September 24, 1998
    Date of Patent: April 3, 2001
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Daisuke Kanenari, Riichiro Mama, Kazuto Yamakawa, Takeo Masaki
  • Pneumatic tire for passenger cars having shoulder recess
    Patent number: 6164353
    Abstract: A pneumatic tire for passenger cars, having a carcass layer laid between left and right beads, and two belt layers provided in an outer peripheral side of the carcass layer in a tread, wherein a width of a second belt layer counted from the side of the carcass layer is set to 95-110% of a ground contacting width of the tread, a recess being provided in each shoulder so that the center of the recess is positioned in a region separate from a position of the shoulder which corresponds to an edge of the second belt layer toward a relative bead by a distance in the range of 8-14% of a width of the same belt.
    Type: Grant
    Filed: July 21, 1999
    Date of Patent: December 26, 2000
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Zenichiro Shida, Riichiro Mama
  • Pneumatic tire tread
    Patent number: 4649975
    Abstract: A pneumatic tire having a tread portion with a tread pattern which is constituted by main grooves, auxiliary grooves, lug grooves and sipes, wherein the mean depth Gc of the auxiliary grooves, the mean depth Gs of the lug grooves and the mean depth Gk of the sipes are determined in relation to the mean depth G of the main grooves so as to meet the following conditions:Gk/G=0.65 to 0.85Gc/G=0.7 to 0.8Gs/G=0.8 to 1.
    Type: Grant
    Filed: June 28, 1985
    Date of Patent: March 17, 1987
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Tomohiko Kogure, Tadayoshi Hiraga, Riichiro Mama, Nobuhito Takasugi
  • Automobile tire
    Patent number: D290105
    Type: Grant
    Filed: June 13, 1984
    Date of Patent: June 2, 1987
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Tadanobu Nagumo, Tadayoshi Hiraga, Riichiro Mama, Tadashi Harashima, Izumi Kuramochi
  • Automobile tire
    Patent number: D407676
    Type: Grant
    Filed: March 6, 1998
    Date of Patent: April 6, 1999
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Hisaya Morishita, Riichiro Mama, Hiroshi Tokizaki, Izumi Kuramochi, Kenichi Shirai
  • Automobile tire
    Patent number: D416835
    Type: Grant
    Filed: December 2, 1998
    Date of Patent: November 23, 1999
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Masahiro Iida, Riichiro Mama, Kenichiro Endo
  • Automobile tire
    Patent number: D419501
    Type: Grant
    Filed: January 21, 1999
    Date of Patent: January 25, 2000
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Masahiro Iida, Riichiro Mama, Kenichiro Endou