Patents by Inventor Hidetaka Tobita

Hidetaka Tobita 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).

  • Process for producing .alpha.,.beta.-unsaturated carboxylic acid polymer
    Patent number: 4743664
    Abstract: A less colored .alpha., .beta.-unsaturated carboxylic acid polymer having a relatively small molecular weigth and a sharp molecular weight distribution is produced by supplying an .alpha.,.beta.-unsaturated carboxylic acid monomer and a hydrogensulfite from one side of a reaction column and simultaneously supplying an oxygen-containing gas concurrently with the monomer to the reaction column. The polymer obtained is preferably used as a dispersant and an antiscaling agent.
    Type: Grant
    Filed: November 19, 1986
    Date of Patent: May 10, 1988
    Inventors: Tadashi Matui, Hidetaka Tobita