Patents by Inventor Katumi Takesita

Katumi Takesita 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 removing and recovering fluorinated alcohol from waste gas
    Patent number: 5233098
    Abstract: A method for removing a perfluoroalkyl alcohol from a waste gas and recovering the perfluoroalkyl alcohol comprising the steps of bringing the waste gas into contact with an aqueous alkaline solution thereby to absorb the perfluoroalkyl alcohol into said solution and consequently obtain an aqueous alkaline solution containing an alkoxide of the perfluoroalkyl alcohol. Adding an acid to the aqueous alkaline solution containing the alkoxide of the perfluoroalkyl alcohol until the alkaline solution turns into an acidic solution with a pH value smaller than 5, thereby to turn said alkoxide into said perfluoroalkyl alcohol and subjecting the acidic solution to distillation to recover the perfluoroalkyl alcohol.
    Type: Grant
    Filed: June 12, 1992
    Date of Patent: August 3, 1993
    Assignee: Central Glass Company, Limited
    Inventors: Toru Nakazora, Toshihiro Nakamichi, Tuneyoshi Hisayuki, Katumi Takesita, Yutaka Katsuhara