Patents by Inventor Shunsuke SAITOH

Shunsuke SAITOH 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 a charge control agent
    Patent number: 9056884
    Abstract: A process for producing a charge control agent comprising an azo-based iron complex salt compound as an effective component, comprises: synthesizing a monoazo compound through diazotization coupling; and ironing the monoazo compound by using an ironizing agent such as ferric chloride to produce an azo-based iron complex salt compound represented by the following formula. The ironization reaction of the monoazo compound is carried out while pH is kept at 7.0 to 8.0. Since the above azo-based iron complex salt compound having high purity can be obtained at a high yield, it can be used as a charge control agent directly and a special purification step can be eliminated, thereby making it possible to greatly cut the production cost.
    Type: Grant
    Filed: March 5, 2013
    Date of Patent: June 16, 2015
    Assignee: HODOGAYA CHEMICAL CO., LTD.
    Inventors: Atsushi Takesue, Yoshihiko Abe, Hideyuki Otsuka, Jun Watanabe, Shunsuke Saitoh, Kanae Hiraishi
  • PROCESS FOR PRODUCING A CHARGE CONTROL AGENT
    Publication number: 20140171628
    Abstract: A process for producing a charge control agent comprising an azo-based iron complex salt compound as an effective component, comprises: synthesizing a monoazo compound through diazotization coupling; and ironing the monoazo compound by using an ironizing agent such as ferric chloride to produce an azo-based iron complex salt compound represented by the following formula. The ironization reaction of the monoazo compound is carried out while pH is kept at 7.0 to 8.0. Since the above azo-based iron complex salt compound having high purity can be obtained at a high yield, it can be used as a charge control agent directly and a special purification step can be eliminated, thereby making it possible to greatly cut the production cost.
    Type: Application
    Filed: March 5, 2013
    Publication date: June 19, 2014
    Applicant: HODOGAYA CHEMICAL CO., LTD.
    Inventors: Atsushi TAKESUE, Yoshihiko ABE, Hideyuki OTSUKA, Jun WATANABE, Shunsuke SAITOH, Kanae HIRAISHI