Patents by Inventor Yoshitugu Minamikawa

Yoshitugu Minamikawa 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 sodium percarbonate
    Patent number: 4409197
    Abstract: A process for producing sodium percarbonate which comprises reacting sodium carbonate with hydrogen peroxide in a working solution of sodium carbonate, hydrogen peroxide and water, said reaction being carried out in the presence of at least one N,N,N',N'-tetra(phosphonomethyl)diaminoalkane of the following formula ##STR1## wherein R is either ##STR2## and n is 0 or 1 to 4, and at least one salt selected from the group consisting of phosphates, silicates and magnesium salts.
    Type: Grant
    Filed: October 27, 1981
    Date of Patent: October 11, 1983
    Assignee: Mitsubishi Gas Chemical Company, Inc.
    Inventors: Junichiro Sugano, Tomoyuki Yui, Yoshitugu Minamikawa, Tsuneo Fujimoto, Minoru Kubota
  • Process for producing sodium percarbonate
    Patent number: 4388287
    Abstract: A process for producing sodium percarbonate which comprises reacting sodium carbonate with hydrogen peroxide in the presence of a stabilizer againsts the decomposition of hydrogen peroxide in a working solution of sodium carbonate, hydrogen peroxide and water, said stabilizer being at least one N,N,N',N'-tetra(phosphonomethyl)diaminoalkane of the following formula ##STR1## wherein R is either ##STR2## and n is 0 or 1 to 4.
    Type: Grant
    Filed: October 27, 1981
    Date of Patent: June 14, 1983
    Assignee: Mitsubishi Gas Chemical Company, Inc.
    Inventors: Junichiro Sugano, Tomoyuki Yui, Yoshitugu Minamikawa, Tsuneo Fujimoto
  • Process for producing quinones
    Patent number: 3953482
    Abstract: A process for producing quinones corresponding to anthracenes or alkylnaphthalenes in high yields and selectivities, which comprises reacting the anthracenes or alkylnaphthalenes with hydrogen peroxide in the liquid phase in the presence of hydrogen chloride as a catalyst. Methanol, for example, may be used as a reaction medium.
    Type: Grant
    Filed: August 9, 1973
    Date of Patent: April 27, 1976
    Assignee: Mitsubishi Gas Chemical Company, Inc.
    Inventors: Junichiro Sugano, Yasuhisa Kuriyama, Yukio Ishiuchi, Yoshitugu Minamikawa