Patents by Inventor Seiki Nishihara

Seiki Nishihara 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).

  • Method for producing polymer blend fibers having phase separation structure
    Patent number: 6245268
    Abstract: Polymer blend fibers having a phase separation structure are provided. The phase separation structure is a sea-island structure and a diameter D1 on a circle basis of an island phase of the sea-island structure in a transverse cross-section of the fibers is in the range of 0.001 to 0.4 &mgr;m.
    Type: Grant
    Filed: October 21, 1998
    Date of Patent: June 12, 2001
    Assignee: Toyo Boseki Kabushiki Kaisha
    Inventors: Tetsushi Oka, Seiki Nishihara, Hiroshi Yasuda
  • Polymer blend fibers having phase separation structure and method for producing the same
    Patent number: 5869183
    Abstract: Polymer blend fibers having a phase separation structure are provided. The phase separation structure is a sea-island structure and a diameter D.sub.1 on a circle basis of an island phase of the sea-island structure in a transverse cross-section of the fibers is in the range of 0.001 to 0.4 .mu.m.
    Type: Grant
    Filed: September 8, 1997
    Date of Patent: February 9, 1999
    Assignee: Toyo Boseki Kabushiki Kaisha
    Inventors: Tetsushi Oka, Seiki Nishihara, Hiroshi Yasuda
  • Polyester resin, compositions thereof and sealant made therefrom
    Patent number: 5382652
    Abstract: A polyester resin (A) having branched chain, a reduction viscosity (.eta. sp/c) of not less than 0.7, and a Z average molecular weight (Mz) relative to standard polystyrene of not less than 250.times.10.sup.3 and not more than 800.times.10.sup.3, a polyester resin composition comprised of resin (A) and a polyester resin (B) without branched chain and having a reduction viscosity (.eta. sp/c) of not less than 0.7., and a polyester resin composition comprised of resin (A) and a polyester resin (C) having branched chain and a melting point lower than that of the polyester resin (A). The sealant made from the polyester resin (A), or the resin compositions of the present invention is superior in heat-sealing properties, flavor retention, and film moldability (extrusion processing characteristics), and is suitable for a sealant for paper and plastic food containers.
    Type: Grant
    Filed: March 30, 1992
    Date of Patent: January 17, 1995
    Assignee: Toyo Boseki Kabushiki Kaisha
    Inventors: Kouji Fukuda, Shigeharu Sugihara, Takeshi Kamoto, Keiji Mori, Seiki Nishihara, Katsuya Emoto, Toshikazu Nishiwaki, Hiroshi Takeuchi
  • Polyester resin, compositions thereof and sealant made therefrom
    Patent number: RE35939
    Abstract: A polyester resin (A) having branched chain, a reduction viscosity (.eta. sp/c) of not less than 0.7, and a Z average molecular weight (Mz) relative to standard polystyrene of not less than 250.times.10.sup.3 and not more than 800.times.10.sup.3, a polyester resin composition comprised of resin (A) and a polyester resin (B) without branched chain and having a reduction viscosity (.eta. sp/c) of not less than 0.7., and a polyester resin composition comprised of resin (A) and a polyester resin (C) having branched chain and a melting point lower than that of the polyester resin (A). The sealant made from the polyester resin (A), or the resin compositions of the present invention is superior in heat-sealing properties, flavor retention, and film moldability (extrusion processing characteristics), and is suitable for a sealant for paper and plastic food containers.
    Type: Grant
    Filed: January 15, 1997
    Date of Patent: October 27, 1998
    Assignee: Toyo Boseki Kabushiki Kaisha
    Inventors: Kouji Fukuda, Shigeharu Sugihara, Takeshi Kamoto, Keiji Mori, Seiki Nishihara, Katsuya Emoto, Toshikazu Nishiwaki, Hiroshi Takeuchi