Patents by Inventor Koichi Takamura

Koichi Takamura 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: 6127461
    Abstract: The present invention relates to the coagglomeration of random vinyl substituted aromatic/C.sub.4 -C.sub.6 conjugated diolefin polymers with sulfur. Said coagglomerate is storage stable and easily blended with asphalt under a variety of mixing conditions. Further, polymer/asphalt blends prepared with the sulfur coagglomerated polymers show improved storage stability against phase separation.
    Type: Grant
    Filed: October 28, 1998
    Date of Patent: October 3, 2000
    Assignee: BASF Corporation
    Inventors: Koichi Takamura, Paul Velasco, Peter Blanpain, John Cheng, Heinz Plaumann, Richard Liu, Wayne Millican, Barry Baughman
  • Patent number: 5998514
    Abstract: The present invention relates to random vinyl substituted aromatic/C.sub.4 -C.sub.6 conjugated diolefin polymer modified asphalt mixtures wherein the modifier is a keto-containing amide such as diacetone acrylamide (DAAM), an oxazoline containing copolymer, and an ethoxylated trimethylolpropane triacrylate.
    Type: Grant
    Filed: December 17, 1998
    Date of Patent: December 7, 1999
    Assignee: BASF Corporation
    Inventors: John Tze-Chiang Cheng, Heinz Plaumann, Koichi Takamura, Arthur Barry Baughman
  • Patent number: 5990203
    Abstract: The present invention relates to a method for improving the compatibility of random vinyl substituted aromatic/C.sub.4 -C.sub.6 conjugated diolefin polymer/asphalt mixtures comprising adding a modifier to said random vinyl substituted aromatic/C.sub.4 -C.sub.6 conjugated diolefin polymer/asphalt mixture selected from the group consisting of:(a) polymers containing an epoxy functionality(b) polymers containing a carboxyl functionality(c) monomers, oligomers, and polymers containing an amine functionality;(d) monomers, oligomers, and polymers containing an ester functionality; or mixtures thereof.
    Type: Grant
    Filed: May 4, 1998
    Date of Patent: November 23, 1999
    Assignee: BASF Corporation
    Inventors: John Tze-Chiang Cheng, Heinz Plaumann, Koichi Takamura, Arthur Barry Baughmann, Wai-chun Richard Liu