Patents by Inventor Sadami Shimizu

Sadami Shimizu 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 tetrabromobisphenol A
    Patent number: 5059726
    Abstract: A process for producing tetrabromobisphenol A, which comprises brominating bisphenol A in methanol, wherein the substrate concentration of bisphenol A to methanol is at most 20 wt/vol %.
    Type: Grant
    Filed: October 22, 1990
    Date of Patent: October 22, 1991
    Assignee: Tosoh Corporation
    Inventors: Hisao Eguchi, Masashige Kubo, Koji Kunimoto, Sadami Shimizu, Masakatsu Sato, Hanzo Tamabayashi
  • Process for producing tetrabromobisphenol A
    Patent number: 5008469
    Abstract: A process for producing tetrabromobisphenol A, which comprises brominating bisphenol A in methanol, wherein the substrate concentration of bisphenol A to methanol is at most 20 wt/vol %.
    Type: Grant
    Filed: January 25, 1990
    Date of Patent: April 16, 1991
    Assignee: Tosoh Corporation
    Inventors: Hisao Eguchi, Masashige Kubo, Koji Kunimoto, Sadami Shimizu, Masakatsu Sato, Hanzo Tamabayashi
  • Method for recovering hydrobromic acid and methanol
    Patent number: 4990321
    Abstract: A method for recovering hydrobromic acid and methanol from a filtrate obtained by brominating bisphenol A in a methanol solvent and filtering off the resulting brominated bisphenol A, which comprises adding water to the filtrate, followed by distillation for purification.
    Type: Grant
    Filed: January 24, 1990
    Date of Patent: February 5, 1991
    Assignee: Tosoh Corporation
    Inventors: Masakatsu Sato, Sadami Shimizu, Hanzo Tamabayashi
  • Method of producing diol by hydrogenolysis of peroxide polymers with reactivation of Raney nickel catalyst
    Patent number: 3980720
    Abstract: A poisoned Raney nickel catalyst from the hydrogenolysis of an organic peroxide polymer is reactivated by treating the catalyst with a 0.1-5 N solution of an activating reagent selected from the group consisting of ammonia, and an alkali metal or an alkaline earth metal hydroxide, carbonate or carboxylate having 1-4 carbon atoms at 20.degree.-200.degree.C under an inert gas atmosphere.
    Type: Grant
    Filed: December 20, 1974
    Date of Patent: September 14, 1976
    Assignee: Toyo Soda Manufacturing Co., Ltd.
    Inventors: Shunsuke Mabuchi, Kenji Tsuzuki, Hideaki Matsunaga, Sadami Shimizu, Makoto Sumita