Patents by Inventor Kunihiko Sasazima

Kunihiko Sasazima 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 preparing hollow fiber having selective gas permeability
    Patent number: 4127625
    Abstract: Asymmetric hollow fibers useful for effecting separations are prepared by spinning a solution of a fiber-forming cellulose derivative through the outer tube of a double tube-type spinneret into an aqueous coagulating bath to form a hollow fiber and simultaneously injecting an aqueous salt solution through the inner tube of the spinneret to contact the interior of the hollow fiber. The hollow fibers are dipped in warm water, then the free water is removed and the fibers are frozen and dried under vacuum.
    Type: Grant
    Filed: January 17, 1977
    Date of Patent: November 28, 1978
    Assignee: Daicel Ltd.
    Inventors: Katsuharu Arisaka, Kazu Watanabe, Kunihiko Sasazima