Patents by Inventor Tomizo Sota

Tomizo Sota 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).

  • Patent number: 6921797
    Abstract: To provide a method of reducing contents of metal components of a fluorine-containing elastomer through preparation thereof and a molded article obtained from the fluorine-containing elastomer having sufficiently reduced contents of metal components. The method of reducing a metal content of the fluorine-containing elastomer through preparation thereof without using a metal oxide, in which among materials excluding a gaseous monomer which are used for polymerization of a fluorine-containing monomer, coagulation and drying, at least one of them contains substantially no metal component, and the fluorine-containing elastomer which has a metal content of not more than 50 ppm and is obtained by that method.
    Type: Grant
    Filed: January 20, 2004
    Date of Patent: July 26, 2005
    Assignee: Daikin Industries, Ltd.
    Inventors: Yoshiyuki Tanaka, Masanori Kitaichi, Tomizo Sota, Tatsuya Morikawa, Toshio Sogabe, Mitsuru Kishine
  • Publication number: 20040147698
    Abstract: To provide a method of reducing contents of metal components of a fluorine-containing elastomer through preparation thereof and a molded article obtained from the fluorine-containing elastomer having sufficiently reduced contents of metal components. The method of reducing a metal content of the fluorine-containing elastomer through preparation thereof without using a metal oxide, in which among materials excluding a gaseous monomer which are used for polymerization of a fluorine-containing monomer, coagulation and drying, at least one of them contains substantially no metal component, and the fluorine-containing elastomer which has a metal content of not more than 50 ppm and is obtained by that method.
    Type: Application
    Filed: January 20, 2004
    Publication date: July 29, 2004
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Yoshiyuki Tanaka, Masanori Kitaichi, Tomizo Sota, Tatsuya Morikawa, Toshio Sogabe, Mitsuru Kishine
  • Patent number: 6703461
    Abstract: To provide a method of reducing contents of metal components of a fluorine-containing elastomer through preparation thereof and a molded article obtained from the fluorine-containing elastomer having sufficiently reduced contents of metal components. The method of reducing a metal content of the fluorine-containing elastomer through preparation thereof without using a metal oxide, in which among materials excluding a gaseous monomer which are used for polymerization of a fluorine-containing monomer, coagulation and drying, at least one of them contains substantially no metal component, and the fluorine-containing elastomer which has a metal content of not more than 50 ppm and is obtained by that method.
    Type: Grant
    Filed: September 25, 2000
    Date of Patent: March 9, 2004
    Assignee: Daikin Industries, Ltd.
    Inventors: Yoshiyuki Tanaka, Masanori Kitaichi, Tomizo Sota, Tatsuya Morikawa, Toshio Sogabe, Mitsuru Kishine
  • Patent number: 6350426
    Abstract: A method of quickly and safely determining the component concentrations of a three-component mixture comprising substantially sulfuric acid, hydrogen fluoride and water, which comprises measuring at least one set of three physical quantities of (1) temperature, (2) ultrasonic wave propagation velocity and (3) electric conductivity or viscosity of the three-component mixture and converting the obtained values to the component concentrations on the basis of a working curve representing the relationship between each component concentration of the three-component mixture and the three physical quantities; and a method of continuous production of hydrogen fluoride for controlling a water concentration in the reaction system by using this method.
    Type: Grant
    Filed: February 8, 1999
    Date of Patent: February 26, 2002
    Assignee: Daikin Industries, Ltd.
    Inventors: Tomizo Sota, Toshinobu Takeuchi, Ichiro Morioka
  • Patent number: 5814713
    Abstract: (i) A method for emulsion polymerization of tetrafluoroethylene, which comprises emulsion-polymerizing tetrafluoroethylene in the presence of a polymerization initiator, a paraffin wax containing not larger than 100 ppm of a reducing substance and an emulsifier, and (ii) a method for preventing irregular polymerization of tetrafluoroethylene, which comprises using the above method for emulsion polymerization give a constant polymerization time, and polytetrafluoroethylene having values of physical properties which meet the desired standard requirements.
    Type: Grant
    Filed: August 6, 1997
    Date of Patent: September 29, 1998
    Assignee: Daikin Industries, Ltd.
    Inventors: Takuo Kawamura, Shigeru Ichiba, Tomizo Sota
  • Patent number: 5546182
    Abstract: In order to quantitatively determine a metal impurity contained in a fluorine-containing polymer directly, and also to improve a detection limit of the metal quantitative determination, there is provided a method for the quantitative determination of a trace amount of a metal impurity contained in a fluorine-containing polymer using a flameless atomic absorption spectrophotometer wherein a predetermined amount of a sample of the polymer containing the metal to be quantitatively determined is incinerated under incineration conditions including an incineration temperature in the range of about 400.degree. to 1200.degree. C. and an incineration period of at least about 100 seconds, and then an absorbance of the incinerated sample as such is measured using the flameless atomic absorption spectrophotometer.
    Type: Grant
    Filed: March 9, 1995
    Date of Patent: August 13, 1996
    Assignee: Daikin Industries Ltd.
    Inventor: Tomizo Sota
  • Patent number: 5122356
    Abstract: A process for purification of hydrochloric acid containing hydrogen fluoride, which process comprises steps of:contacting the hydrochloric acid containing hydrogen fluoride with at least one silicon compound of the formula:R.sup.1 R.sup.2 R.sup.3 SiX (1)wherein X is chlorine, hydroxyl or OSiR.sup.4 R.sup.5 R.sup.6, and R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5 and R.sup.6 are the same or different and alkyl groups having 1 to 4 of carbon atoms, andrecovering a trialkylfluorosilane compound produced in said contacting step of the formula:R.sup.1 R.sup.2 R.sup.3 SiF (2)wherein R.sup.1, R.sup.2 and R.sup.3 are the same as defined above,said recovering step comprising sub-steps of: hydrolyzing the produced trialkylfluorosilane compound (2) after the recovery thereof to convert to a trialkylsilanol compound of the formula:R.sup.1 R.sup.2 R.sup.3 SiOH (3)wherein R.sup.1, R.sup.2 and R.sup.
    Type: Grant
    Filed: March 20, 1991
    Date of Patent: June 16, 1992
    Assignee: Daikin Industries Ltd.
    Inventors: Takuo Kawamura, Tomizo Sota