Patents by Inventor Tsutomu Hisada

Tsutomu Hisada 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).

  • Polytrimethylene terephthalate resin
    Patent number: 7198846
    Abstract: A polytrimethylene terephthalate resin comprising: 90 to 100 mole % of trimethylene terephthalate recurring units, and 0 to 10 mole % of at least one monomer unit obtained from a comonomer other than the monomers used for forming the recurring units and copolymerizable with at least one of the monomers used for forming the recurring units, which resin has the following characteristics: (A) an intrinsic viscosity [?] of from 0.8 to 4.0 dl/g; (B) an Mw/Mn of from 2.0 to 2.7; (C) a psychometric lightness L-value (L-1) of from 70 to 100 and a psychometric chroma b*-value (b*-1) of from ?5 to 25; and (D) a psychometric lightness L-value (L-2) of from 70 to 100 and a psychometric chroma b*-value (b*-2) of from ?5 to 25 as measured after heating the resin at 180° C. for 24 hours in air.
    Type: Grant
    Filed: June 13, 2003
    Date of Patent: April 3, 2007
    Assignee: Asahi Kasei Kabushiki Kaisha
    Inventors: Katsuhiro Fujimoto, Yoichiro Azuma, Tsutomu Hisada
  • Polytrimethylene terephthalate resin
    Publication number: 20060058497
    Abstract: A polytrimethylene terephthalate resin comprising: 90 to 100 mole % of trimethylene terephthalate recurring units, and 0 to 10 mole % of at least one monomer unit obtained from a comonomer other than the monomers used for forming the recurring units and copolymerizable with at least one of the monomers used for forming the recurring units, which resin has the following characteristics: (A) an intrinsic viscosity [?] of from 0.8 to 4.0 dl/g; (B) an Mw/Mn of from 2.0 to 2.7; (C) a psychometric lightness L-value (L-1) of from 70 to 100 and a psychometric chroma b*-value (b*-1) of from ?5 to 25; and (D) a psychometric lightness L-value (L-2) of from 70 to 100 and a psychometric chroma b*-value (b*-2) of from ?5 to 25 as measured after heating the resin at 180° C. for 24 hours in air.
    Type: Application
    Filed: June 13, 2003
    Publication date: March 16, 2006
    Inventors: Katsuhiro Fujimoto, Yoichiro Azuma, Tsutomu Hisada