Patents by Inventor Hisakazu Itoh

Hisakazu Itoh 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 silicon tetrafluoride
    Patent number: 6770253
    Abstract: A process for producing silicon tetrafluoride includes reacting at 250° C. or higher elemental silicon with hydrogen fluoride, thereby producing a gas product containing silicon tetrafluoride. This reaction can be conducted such that the gas product contains at least 0.02 volume % of the unreacted hydrogen fluoride. The process may further include bringing the gas product into contact with elemental nickel at a temperature of 600° C. or higher. Alternatively, the process may further include adding at least 0.1 volume % of hydrogen fluoride to the gas product to prepare a gas mixture; and bringing the gas mixture into contact with elemental nickel at a temperature of 400° C. or higher.
    Type: Grant
    Filed: September 10, 2002
    Date of Patent: August 3, 2004
    Assignee: Central Glass Company, Limited
    Inventors: Shinsuke Nakagawa, Takaaki Shibayama, Atsushi Ryokawa, Hisakazu Itoh
  • Process for producing silicon tetrafluoride
    Publication number: 20030095909
    Abstract: A process for producing silicon tetrafluoride includes reacting at 250° C. or higher elemental silicon with hydrogen fluoride, thereby producing a gas product containing silicon tetrafluoride. This reaction can be conducted such that the gas product contains at least 0.02 volume % of the unreacted hydrogen fluoride. The process may further include bringing the gas product into contact with elemental nickel at a temperature of 600° C. or higher. Alternatively, the process may further include adding at least 0.1 volume % of hydrogen fluoride to the gas product to prepare a gas mixture; and bringing the gas mixture into contact with elemental nickel at a temperature of 400° C. or higher.
    Type: Application
    Filed: September 10, 2002
    Publication date: May 22, 2003
    Applicant: Central Glass Company, Limited
    Inventors: Shinsuke Nakagawa, Takaaki Shibayama, Atsushi Ryokawa, Hisakazu Itoh