Patents by Inventor Akio Kuroiwa

Akio Kuroiwa 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 for producing ?-mercapto carboxylic acids
    Patent number: 8258340
    Abstract: An object of the present invention is to provide a method for industrially producing ?-mercapto carboxylic acids that are useful as synthetic raw materials for medicines and agrochemicals or as additives for polymer compounds from easily available ?,?-unsaturated carboxylic acids in high yields and productivity. The present invention is characterized in that a solvent having an amide group and represented by the formula (1) is used when the ?,?-unsaturated carboxylic acids are reacted with hydrogen sulfides to produce the ?-mercapto carboxylic acids. Particularly, it is more preferable to carry out the reaction at a pH range of 6.0 to 8.
    Type: Grant
    Filed: March 11, 2009
    Date of Patent: September 4, 2012
    Assignee: Showa Denko K.K.
    Inventors: Hidemasa Aoki, Akio Kuroiwa, Akira Shibuya
  • METHOD FOR PRODUCING BETA-MERCAPTO CARBOXYLIC ACIDS
    Publication number: 20110015436
    Abstract: An object of the present invention is to provide a method for industrially producing ?-mercapto carboxylic acids that are useful as synthetic raw materials for medicines and agrochemicals or as additives for polymer compounds from easily available ?,?-unsaturated carboxylic acids in high yields and productivity. The present invention is characterized in that a solvent having an amide group and represented by the formula (1) is used when the ?,?-unsaturated carboxylic acids are reacted with hydrogen sulfides to produce the ?-mercapto carboxylic acids. Particularly, it is more preferable to carry out the reaction at a pH range of 6.0 to 8.
    Type: Application
    Filed: March 11, 2009
    Publication date: January 20, 2011
    Applicant: Showa Denko K.K.
    Inventors: Hidemasa Aoki, Akio Kuroiwa, Akira Shibuya