Patents by Inventor Tetsuaki Sugita

Tetsuaki Sugita 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 of producing polyetherester monomer and cement dispersants
    Patent number: 6433114
    Abstract: Polyetherester monomers of a high quality are produced by causing an esterification reaction of polyalkyleneglycol with a closed end of a specified kind which has been refined so as to contain residual free acid by less than 0.03 weight %, as converted to acetic acid, and unsaturated carboxylic acid of another specified kind by using a specified amount of an acid catalyst under a heated and reduced-pressure condition in the absence of solvents and in the presence of p-benzoquinone and/or phenothiazine while distilling away generated water. Cement dispersants are produced by using water-soluble vinyl copolymers obtained by a radical copolymerization reaction between such polyetherester monomers and vinyl monomers.
    Type: Grant
    Filed: June 19, 2001
    Date of Patent: August 13, 2002
    Assignee: Takemoto Yushi Kabushiki Kaisha
    Inventors: Mitsuo Kinoshita, Tetsuaki Sugita