Patents by Inventor Mitsunaga Dohzaki

Mitsunaga Dohzaki 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).

  • Method of dehydrating tolylenediamine and dehydrator
    Patent number: 8524047
    Abstract: A method of dehydrating tolylenediamine which includes subjecting tolylenediamine having a water content of 5-40 wt. % to first-stage distillation at a vacuum of 13-101.3 kPa and subjecting the bottoms from the first-stage distillation to second-stage distillation at a vacuum lower than 13kPa.
    Type: Grant
    Filed: November 25, 2008
    Date of Patent: September 3, 2013
    Assignee: Mitsui Chemicals Inc.
    Inventors: Toshiyuki Ogawa, Mitsunaga Dohzaki, Masaaki Sasaki
  • METHOD OF DEHYDRATING TOLYENEDIAMINE AND DEHYDRATOR
    Publication number: 20100243423
    Abstract: A method of dehydrating tolylenediamine which includes subjecting tolylenediamine having a water content of 5-40 wt. % to first-stage distillation at a vacuum of 13-101.3 kPa and subjecting the bottoms from the first-stage distillation to second-stage distillation at a vacuum lower than 13 kPa.
    Type: Application
    Filed: November 25, 2008
    Publication date: September 30, 2010
    Inventors: Toshiyuki Ogawa, Mitsunaga Dohzaki, Masaaki Sasaki