Patents by Inventor Shunji Yago

Shunji Yago 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).

  • Catalyst for ortho-alkylation of phenols, a precursor thereof, and production of ortho-alkylated phenols by use of said catalyst
    Patent number: 5847237
    Abstract: There is disclosed a catalyst for ortho-alkylation of phenols obtained by calcination of a catalyst precursor comprising a dry mixture of:(a) manganese oxalate;(b) phenolic resin fine particles; and(c) at least one magnesium compound selected from the group consisting of basic magnesium carbonate and magnesium hydroxide.There is further disclosed a process for producing ortho-alkylated phenols by the gas phase reaction between an alkyl alcohol and a phenol in the presence of the ortho-alkylation catalyst defined above.
    Type: Grant
    Filed: July 3, 1996
    Date of Patent: December 8, 1998
    Assignee: Honshu Chemical Industry Co., Ltd.
    Inventors: Shunji Yago, Takashi Kakiuchi, Keiji Arimatsu, Fujihisa Matsunaga
  • Method for preparing p,p'-biphenol
    Patent number: 5099076
    Abstract: The present invention is directed to a method for the preparation of p,p'-biphenol by simplified processes achieved by batch or continuous operations which comprises using phenol and isobutylene as starting materials, allowing phenol to react with isobutylene in the presence of aluminum phenoxide, oxidizing the resulting reaction liquid in the presence of an alkaline catalyst, and debutylating the reaction liquid in the presence of a debutylation catalyst.
    Type: Grant
    Filed: October 5, 1990
    Date of Patent: March 24, 1992
    Assignee: Honshu Chemical Industry Co., Ltd.
    Inventors: Katsunori Takahashi, Mikio Kawahara, Shunji Yago, Yoshiharu Ayabe