Patents by Inventor Arihiko Umeda

Arihiko Umeda 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).

  • Modified polyoxyalkylenepolyamine curing agents for epoxy resins
    Patent number: 4436891
    Abstract: Disclosed are curing agents for epoxy resins consisting of modified polyoxyalkylenepolyamines obtained by the addition reaction of an alkyleneimine to a polyoxyalkylenepolyamine, preferably a polyoxypropylenepolyamine or polyoxyethylenepolyalkylamine, and ethyleneimine or propyleneimine in acid medium.
    Type: Grant
    Filed: September 7, 1982
    Date of Patent: March 13, 1984
    Assignee: Texaco Inc.
    Inventors: Arihiko Umeda, Yoshiyuki Iwase
  • Curing agents for polyurethane and process using same
    Patent number: 4431790
    Abstract: Disclosed are novel curing agents for polyurethanes comprising reaction products of (1) a polyoxy alkylenepolyamine with (2) an alpha-substituted acrylic acid derivative wherein the substituent has a terminal hydroxyl group or (3) with a compound having an oxyrane ring and reaction products of (1) and (2) above, with (3) and (1) and (3) above, with (2). Also disclosed is a process for making polyurethanes by condensing a polyol with an isocyanate in the presence of the present curing agents in an amount ranging from 5 to 100 percent by weight of the polyol.
    Type: Grant
    Filed: August 3, 1981
    Date of Patent: February 14, 1984
    Assignee: Texaco Inc.
    Inventors: Arihiko Umeda, Seiichi Ota, Yoshiyuki Iwase