Patents Assigned to Danippon Ink and Chemicals, Inc.
  • Method for symmetrically dimerizing phenols and process for producing biphenols
    Patent number: 4962240
    Abstract: A method for symmetrically dimerizing phenols which comprises oxidizing phenols in molten state in the liquid phase using a transition metal compound as a catalyst and an oxygen-containing gas as an oxidizing agent to conduct dimerization; and a process for producing diphenols which comprises oxidizing phenols in molten state in the liquid phase using a transition metal compound as a catalyst and an oxygen-containing gas as an oxidizing agent to conduct dimerization, and then interrupting introduction of the oxygen-containing gas to conduct a proton disproportionation reaction.
    Type: Grant
    Filed: March 9, 1989
    Date of Patent: October 9, 1990
    Assignee: Danippon Ink and Chemicals, Inc.
    Inventors: Taku Kitamura, Noriko Kurokawa, Katsuji Takahashi
  • Bowling lane and method of repairing same
    Patent number: 4910073
    Abstract: A bowling lane is disclosed, which comprises a substrate having provided thereon an epoxy resin layer and a polyurethane resin layer in this order. Also disclosed is a method of repairing a bowling lane, comprising coating a degased epoxy resin on the surface of a substrate of a bowling lane to form an epoxy resin layer and further coating a degased polyurethane resin on the epoxy resin layer.
    Type: Grant
    Filed: February 4, 1988
    Date of Patent: March 20, 1990
    Assignee: Danippon Ink and Chemicals, Inc.
    Inventors: Hiroshi Tamura, Fumio Yamamoto, Masaichi Kaneko