Patents by Inventor Tateki Yamakawa

Tateki Yamakawa 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).

  • Composite fiber
    Patent number: 6811874
    Abstract: A core/sheath conjugate fiber comprises a sheath component B of an ethylene-vinyl alcohol copolymer and a core component A of a different thermoplastic polymer. In its cross section, the core component A has at least 10 projections or exists as an aligned group of at least 10 flattened cross-section core components, the distance (I) between the neighboring projections or between the neighboring flattened cross-section core components is at most 1.
    Type: Grant
    Filed: August 13, 2003
    Date of Patent: November 2, 2004
    Assignee: Kuraray Co., Ltd.
    Inventors: Kazuhiko Tanaka, Masao Kawamoto, Hitoshi Nakatsuka, Nobuhiro Koga, Ichirou Inoue, Tateki Yamakawa
  • Composite fiber
    Publication number: 20040038028
    Abstract: A core/sheath conjugate fiber comprises a sheath component B of an ethylene-vinyl alcohol copolymer and a core component A of a different thermoplastic polymer. In its cross section, the core component A has at least 10 projections or exists as an aligned group of at least 10 flattened cross-section core components, the distance (I) between the neighboring projections or between the neighboring flattened cross-section core components is at most 1.
    Type: Application
    Filed: August 13, 2003
    Publication date: February 26, 2004
    Inventors: Kazuhiko Tanaka, Masao Kawamoto, Hitoshi Nakatsuka, Nobuhiro Koga, Ichirou Inoue, Tateki Yamakawa
  • Process of making hollow fibers and treating fibers
    Patent number: 6635204
    Abstract: The present invention provides a hollow fiber, which includes: at least one thermoplastic polymer with an equilibrium water content of 2% or less; wherein the number of hollow portions (&agr;1) and a hollow ratio (&agr;2) in said fiber satisfy the following equations: &agr;1≧7 2≦&agr;2≦65 0.14≦(&agr;1×&agr;2)/100≦250.
    Type: Grant
    Filed: March 13, 2002
    Date of Patent: October 21, 2003
    Assignee: Kuraray Co., Ltd.
    Inventors: Kazuhiko Tanaka, Hitoshi Nakatsuka, Nobuhiro Koga, Masao Kawamoto, Akihiro Hokimoto, Tateki Yamakawa, Ichirou Inoue, Kiyoshi Hirakawa
  • Hollow fibers and manufacturing method of hollow fibers
    Publication number: 20020150756
    Abstract: The present invention provides a hollow fiber, which includes:
    Type: Application
    Filed: March 13, 2002
    Publication date: October 17, 2002
    Applicant: KURARAY CO. LTD.
    Inventors: Kazuhiko Tanaka, Hitoshi Nakatsuka, Nobuhiro Koga, Masao Kawamoto, Akihiro Hokimoto, Tateki Yamakawa, Ichirou Inoue, Kiyoshi Hirakawa
  • Hollow fibers and manufacturing method of hollow fibers
    Patent number: 6455156
    Abstract: The present invention provides a hollow fiber, which includes: at least one thermoplastic polymer with an equilibrium water content of 2% or less; wherein the number of hollow portions (&agr;1) and a hollow ratio (&agr;2) in said fiber satisfy the following equations: &agr;1≧7 2≦&agr;2≦65 0.14≦(&agr;1×&agr;2)/100≦250.
    Type: Grant
    Filed: March 16, 2001
    Date of Patent: September 24, 2002
    Assignee: Kuraray Co., Ltd.
    Inventors: Kazuhiko Tanaka, Hitoshi Nakatsuka, Nobuhiro Koga, Masao Kawamoto, Akihiro Hokimoto, Tateki Yamakawa, Ichirou Inoue, Kiyoshi Hirakawa
  • Hollow fibers and manufacturing method of hollow fibers
    Publication number: 20010053646
    Abstract: The present invention provides a hollow fiber, which includes:
    Type: Application
    Filed: March 16, 2001
    Publication date: December 20, 2001
    Applicant: Kuraray Co., Ltd.
    Inventors: Kazuhiko Tanaka, Hitoshi Nakatsuka, Nobuhiro Koga, Masao Kawamoto, Akihiro Hokimoto, Tateki Yamakawa, Ichirou Inoue, Kiyoshi Hirakawa