Patents by Inventor Kouichi Ohnaka

Kouichi Ohnaka 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 preparing alkali metal salt of carboxymethyl cellulose ether
    Patent number: 4063018
    Abstract: An alkali metal salt of carboxymethyl cellulose ether is prepared by dissolving an alkali in a water-containing organic solvent, adding starting cellulose to the solution, stirring the mixture to form a slurry of the alkali cellulose and then reacting it with an etherifying agent. Alternatively, it is prepared by reacting the starting cellulose in a water-containing solvent with sodium monochloroacetate as an etherifying agent, in the presence of an alkali.
    Type: Grant
    Filed: April 2, 1976
    Date of Patent: December 13, 1977
    Assignee: Daicel Ltd.
    Inventors: Kouichi Ohnaka, Shigeo Yokoi, Takeo Ohmiya