Patents by Inventor Hanzo Tamabayashi

Hanzo Tamabayashi 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).

  • Tetrabromobisphenol A having a large particle size and process for its production
    Patent number: 5302761
    Abstract: Single crystals of tetrabromobisphenol A having an average particle size of from 150 to 500 .mu.m, each having a polyhedral shape.
    Type: Grant
    Filed: May 19, 1993
    Date of Patent: April 12, 1994
    Assignee: Tosoh Corporation
    Inventors: Hanzo Tamabayashi, Shinji Kakimoto, Tetsuto Mizui, Akihiko Nomura, Koji Kunimoto
  • 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
  • Process for producing ammonium p-styrenesulfonate
    Patent number: 4115436
    Abstract: Ammonium p-styrenesulfonate is produced in a process which comprises reacting an amine having more than 7 carbon atoms and a mineral acid with an alkali metal p-styrenesulfonate in an aqueous media to produce an amine salt of p-styrenesulfonic acid and then reacting ammonia with said amine salt.
    Type: Grant
    Filed: July 8, 1977
    Date of Patent: September 19, 1978
    Assignee: Toyo Soda Manufacturing Co., Ltd.
    Inventors: Kanzi Katsuragawa, Tatsuo Hattori, Keiichi Kihara, Hanzo Tamabayashi
  • Process for producing alkali metal styrenesulfonate
    Patent number: 4110366
    Abstract: An alkali metal styrenesulfonate is produced by extracting from an aqueous solution by contacting an aqueous solution containing an alkali metal halide and an alkali metal styrenesulfonate with an organic solvent containing a protonic acid salt of an amine of more than 7 carbon atoms as the extracting reagent, and then back-extracting the styrenesulfonic acid anions with an aqueous solution of an alkali metal hydroxide.
    Type: Grant
    Filed: December 1, 1976
    Date of Patent: August 29, 1978
    Assignee: Toyo Soda Manufacturing Co., Ltd.
    Inventors: Hanzo Tamabayashi, Tatsuo Hattori, Tetsuo Tanaka, Yasuhiro Oda, Keiichi Kihara
  • Process for producing ammonium p-styrenesulfonate
    Patent number: 4061669
    Abstract: Ammonium p-styrenesulfonate is produced in a process which comprises reacting an amine having more than 7 carbon atoms and a mineral acid with an alkali metal p-styrenesulfonate in an aqueous media to produce an amine salt of p-styrenesulfonic acid and then reacting ammonia with said amine salt.
    Type: Grant
    Filed: August 28, 1975
    Date of Patent: December 6, 1977
    Assignee: Toyo Soda Manufacturing Co., Ltd.
    Inventors: Kanzi Katsuragawa, Tatsuo Hattori, Keiichi Kihara, Hanzo Tamabayashi
  • Process for producing ammonium aromatic sulfonate
    Patent number: 4029640
    Abstract: A process for producing an ammonium p-styrenesulfonate or polymer thereof which comprisesReacting an alkali metal p-styrenesulfonate or a polymer thereof with an inorganic ammonium salt in a medium of a hydrophilic alcohol, or a mixture of a hydrophilic organic solvent and water.
    Type: Grant
    Filed: May 27, 1975
    Date of Patent: June 14, 1977
    Assignee: Toyo Soda Manufacturing Co., Ltd.
    Inventors: Tatsuo Hattori, Kanzi Katsuragawa, Keiichi Kihara, Isao Ono, Hanzo Tamabayashi