Patents by Inventor Hisahiro Kinoshita

Hisahiro Kinoshita 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 the manufacture of mercury free sulfuric acid
    Patent number: 4057423
    Abstract: A method of manufacturing sulfuric acid free of impurities such as mercury by the contact process, which comprises the steps: scrubbing the roasting gas coming out of a mist Cottrell with sulfuric acid having a concentration of 30 to 99% and a temperature of more than 20.degree. C within one or two mercury absorption towers (the drying tower per se may suffice) or further within an additional mercury absorption tower disposed on the outlet side of the main blower; and adding a reagent such as a sulfide, a hydrosulfide compound of alkali metal or alkaline earth metal, hydrogen sulfide, selenium compound, sulfur, etc.
    Type: Grant
    Filed: December 15, 1975
    Date of Patent: November 8, 1977
    Assignees: Mitsui Mining & Smelting Co., Ltd., Hachinohe Smelting Co., Ltd.
    Inventor: Hisahiro Kinoshita
  • Method for the manufacture of mercury free sulfuric acid
    Patent number: 3954451
    Abstract: A method of manufacturing sulfuric acid free of impurities such as mercury by the contact process, which comprises the steps: scrubbing the roasting gas coming out of a mist Cottrell with sulfuric acid having a concentration of 30 to 99% and a temperature of more than 20.degree.C within one or two mercury absorption towers (the drying tower per se may suffice) or further within an additional mercury absorption tower disposed on the outlet side of the main blower; and adding a reagent such as a sulfide, a hydrosulfide compound of alkali metal or alkaline earth metal, hydrogen sulfide, selenium compound, sulfur, etc.
    Type: Grant
    Filed: September 6, 1972
    Date of Patent: May 4, 1976
    Assignees: Mitsui Mining & Smelting Co., Ltd., Hachinohe Smelting Co., Ltd.
    Inventor: Hisahiro Kinoshita