Patents by Inventor Toshio Nagayasu

Toshio Nagayasu 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 separating pentafluoroethane and 1,1,1-trifluoroethane
    Patent number: 6047560
    Abstract: A process for separating pentafluoroethane and 1,1,1-trifluoroethane, which comprises extraction distilling a mixed fluid comprising pentafluoroethane and 1,1,1-trifluoroethane in the presence of at least one extracting agent selected from the group consisting of esters and ketones each having a standard boiling point of from -10.degree. C. to 100.degree. C. Also disclosed is a process for separating pentafluoroethane, 1,1,1-trifluoroethane and chloropentafluoroethane, which comprises extraction distilling a mixed fluid comprising pentafluoroethane, 1,1,1-trifluoroethane and chloropentafluoroethane in the presence of at least one extracting agent selected from the group consisting of esters and ketones each having a standard boiling point of from -10.degree. C. to 100.degree. C.
    Type: Grant
    Filed: March 12, 1998
    Date of Patent: April 11, 2000
    Assignee: Showa Denko K.K.
    Inventors: Atsuo Nishimura, Toshio Nagayasu, Reiji Takahashi