Patents by Inventor Youichi Owan

Youichi Owan 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 of suppressing the rise in surface temperature of heating tubes by ammonia injection
    Patent number: 4220519
    Abstract: According to this invention, there is provided a method of suppressing the rise in surface temperature of the heating tubes in a fractionation apparatus for a crude oil, characterized in that an aqueous solution containing ammonia or ammonium ion is injected into the upstream line of the crude heater in an amount of 1 to 20 ppm in terms of ammonia based on the crude oil.
    Type: Grant
    Filed: November 9, 1978
    Date of Patent: September 2, 1980
    Assignee: Nippon Petroleum Refining Company, Limited
    Inventors: Kohei Fujita, Youichi Owan, Minoru Ozawa