Patents by Inventor Shuzabu Sakaguchi

Shuzabu Sakaguchi 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).

  • Methylthiophenol derivatives and p-methylthiophenyl chloroformates and processes for producing these derivatives
    Patent number: 5187311
    Abstract: Novel methylthiophenol derivatives of the formula (I') and of the formula (IV) and processes for producing said derivatives ##STR1## wherein R is a tert-butyloxy group, a tert-amyloxy group, a p-methoxybenzyloxy group, a 2-(trimethylsilyl)ethoxy group, a 1-adamantyloxy group, a bornyloxy group, or an isobornyloxy group.
    Type: Grant
    Filed: September 20, 1991
    Date of Patent: February 16, 1993
    Assignee: Mitsubishi Gas Chemical Company, Inc.
    Inventors: Mutsuhiko Takeda, Isao Hagiwara, Fumiya Zaima, Shuzabu Sakaguchi
  • Process for production of sulfonium compounds
    Patent number: 5149857
    Abstract: A process for producing sulfonium compounds represented by the general formula (III) which comprises reacting alkylthiophenol derivatives represented by the general formula (I) and dialkyl sulfate represented by the general formula (II).General Formula (I): ##STR1## General Formula (II): (R.sup.2).sub.2 SO.sub.
    Type: Grant
    Filed: May 29, 1990
    Date of Patent: September 22, 1992
    Assignee: Mitsubishi Gas Chemical Company, Inc.
    Inventors: Mutsuhiko Takeda, Isao Hagiwara, Fumiya Zaima, Shuzabu Sakaguchi
  • Process for production of sulfonium compounds and novel methylthiphenol derivatives
    Patent number: 5075476
    Abstract: Disclosed is process for producing a sulfonium compound of the general formula (III), comprising reacting alkylthiophenol derivative of the general formula (I) and dialkyl sulfate of the general formula (II) in the presence of at least one inorganic compound selected from the group consisting of alkali metal carbonate, alkali metal hydrogencarbonate, alkaline earth metal hydroxide, alkaline earth metal carbonate, and oxides of Group II metals of the Periodic Table. ##STR1## wherein all the symbols are as defined in the appended claims.
    Type: Grant
    Filed: May 29, 1990
    Date of Patent: December 24, 1991
    Assignee: Mitsubishi Gas Chemical Company, Inc.
    Inventors: Mutsuhiko Takeda, Isao Hagiwara, Fumiya Zaima, Shuzabu Sakaguchi
  • Process for producing benzophenone-azine
    Patent number: 4751326
    Abstract: An improved process for producing benzophenone-azine in which a catalyst can be removed, recovered and recycled is disclosed.
    Type: Grant
    Filed: December 20, 1984
    Date of Patent: June 14, 1988
    Assignee: Mitsubishi Gas Chemical Company, Inc.
    Inventors: Takanari Nawata, Shuzabu Sakaguchi, Toshiaki Kohzaki, Osamu Aoki, Norio Takeda, Masafumi Shimpo
  • Process for preparing benzophenone-azines
    Patent number: 4727190
    Abstract: A process for continuously preparing benzophenone-azines comprising oxidizing benzophenone-imines with molecular oxygen or a molecular oxygen-containing gas in the presence of a copper halide catalyst is disclosed. The oxidation reaction is carried out in a multistage system under an oxygen partial pressure gradually decreasing from the former stage to the latter stage and at a conversion gradually decreasing from the former stage to the latter stage, while controlling the conversion so that the molar ratio of the benzophenone-imines to the copper halide in the final stage be maintained at 1 or more. By the process, the continuous reaction can stably be performed at a high conversion of the benzophenone-imines without involving insolubilization and sedimentation of the catalyst.
    Type: Grant
    Filed: October 14, 1986
    Date of Patent: February 23, 1988
    Assignee: Mitsubishi Gas Chemical Company, Inc.
    Inventors: Takanari Nawata, Shuzabu Sakaguchi, Toshiaki Kohzaki, Osamu Aoki, Norio Takeda, Yoshiyuki Aoki, Masafumi Shimpo
  • Process for preparing hydrazine hydrohalogenide
    Patent number: 4628119
    Abstract: A process for preparing hydrazine hydrohalogenide is disclosed.
    Type: Grant
    Filed: February 19, 1985
    Date of Patent: December 9, 1986
    Assignee: Mitsubishi Gas Chemical Co., Inc.
    Inventors: Takanari Nawata, Shuzabu Sakaguchi, Osamu Aoki
  • Process for producing benzophenone-azines
    Patent number: 4347383
    Abstract: A process for producing a benzophenone-azine which comprises reacting the corresponding benzophenone-imine with molecular oxygen or benzophenone with ammonia and molecular oxygen in the presence of a catalyst selected from the group consisting of metals, metal oxides and alloys of two or more metals, particularly copper or copper alloy-containing catalyst, is disclosed.
    Type: Grant
    Filed: May 6, 1980
    Date of Patent: August 31, 1982
    Assignee: Mitsubishi Gas Chemical Company, Inc.
    Inventors: Tomiya Isshiki, Tetsuo Tomita, Shuzabu Sakaguchi, Toshiaki Kohzaki, Osamu Aoki, Norio Takeda, Yoshiyuki Aoki