Patents by Inventor Osami Tozawa

Osami Tozawa 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 removing dissolved gas from liquid
    Patent number: 5078755
    Abstract: This invention relates to a method of removing dissolved gas from liquid, which comprises bringing the liquid containing the gas dissolved therein into contact with a membrane, thereby causing the dissolved gas to selectively permeate the membrane. The membrane is a permselective, composite membrane composed of a porous support and a nonporous, active membrane of a synthetic resin formed on the porous support, or is a permeable membrane having such characteristics that the nitrogen gas permeation rate at 30.degree. C. is in the range from 7.times.10.sup.-4 to 2.times.10.sup.2 Nm.sup.3 m.sup.2 .multidot.h.multidot.atom and that the amount of permeated steam is 100 g/m.sup.2 .multidot.h or less when 20.degree. C. water is supplied to the membrane under atmospheric pressure while maintaining the pressure on its permeate side at 40 mmHg.
    Type: Grant
    Filed: January 10, 1991
    Date of Patent: January 7, 1992
    Assignee: Nitto Denko Corporation
    Inventors: Osami Tozawa, Takeshi Sasaki, Akira Shimazu, Akio Iwama