Patents by Inventor Seiji Uchiyama

Seiji Uchiyama 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 xylyleneglycol
    Patent number: 4507510
    Abstract: Xylyleneglycol is produced by diazotization reaction of xylylenediamine in the presence of more than 5 parts by weight of water per 1 part of xylylenediamine, while maintaining the PH of the reaction mixture in the range of 1.5 to 5.0.
    Type: Grant
    Filed: December 28, 1983
    Date of Patent: March 26, 1985
    Assignee: Mitsubishi Gas Chemical Company, Inc.
    Inventors: Shigeo Yoshinaka, Tsukasa Toki, Tomoji Tsuji, Seiji Uchiyama
  • Process for producing aromatic aldehydes
    Patent number: 4399311
    Abstract: In a process for producing aromatic aldehydes by reacting chlorinated methylbenzenes with nitric acid, the improvement wherein a lead compound is added to the residue left after separation and recovery of the resulting aromatic aldehydes from the reaction mixture thereby to remove a chlorine ion present in the residue as a precipitate of lead chloride, and the residue left after removal of the lead chloride is recycled to the reaction of the chlorinated methylbenzenes with nitric acid.
    Type: Grant
    Filed: July 13, 1981
    Date of Patent: August 16, 1983
    Assignee: Mitsubishi Gas Chemical Company, Inc.
    Inventors: Shigeo Yoshinaka, Tsukasa Toki, Misuzu Wakatsuki, Seiji Uchiyama
  • Process for producing phthaloyl dichlorides of high purity
    Patent number: 4165337
    Abstract: A batchwise or continuous process for producing isophthaloyl dichloride or terephthaloyl dichloride having a high purity which comprises, in combination, (1) a first step of producing .alpha.,.alpha.,.alpha.,.alpha.',.alpha.',.alpha.'-hexachloroxylene by reacting meta- or para-xylene with chlorine under the irradiation of ultraviolet-containing rays, the reaction being carried out in the presence of, as a solvent, .alpha.,.alpha.,.alpha.,.alpha.',.alpha.',.alpha.'-hexachloroxylene added at the outset of the reaction; (2) a second step of producing isophthaloyl dichloride or terephthaloyl dichloride by reacting the .alpha.,.alpha.,.alpha.,.alpha.',.alpha.',.alpha.'-hexachloroxylene obtained in the first step with isophthalic acid or terephthalic acid; and (3) a third step of purifying the isophthaloyl dichloride or terephthaloyl dichloride obtained in the second step by dissolving the isophthaloyl dichloride or terephthaloyl dichloride in 0.
    Type: Grant
    Filed: October 25, 1977
    Date of Patent: August 21, 1979
    Assignee: Mitsubishi Gas Chemical Company, Inc.
    Inventors: Shigeo Yoshinaka, Masaharu Doya, Seiji Uchiyama, Sadao Nozaki
  • Process for preparing perchloromethylbenzene
    Patent number: 4048033
    Abstract: A process for producing perchloromethylbenzene by reacting a methylbenzene selected from the group consisting of compounds of the formula ##STR1## WHEREIN X is a chlorine or bromine atom, m is a number of 0, 1 or 2, and n is an integer of 1 to 3,And compounds of the above formula wherein the side chain methyl group is partially chlorinated, with chlorine under the irradiation of light containing ultraviolet rays, characterized in that the reaction is carried out in the presence of said perchloromethylbenzene in the reaction system as a solvent.
    Type: Grant
    Filed: September 10, 1974
    Date of Patent: September 13, 1977
    Assignee: Mitsubishi Gas Chemical Company, Inc.
    Inventors: Shigeo Yoshinaka, Seiji Uchiyama, Masaharu Doya