Patents by Inventor Toshihiro Hirotsu

Toshihiro Hirotsu 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).

  • Water-alcohol separating membrane and method for separation of water and alcohol by the use thereof
    Patent number: 4820418
    Abstract: An insolubilized silk fibroin membrane possesses an ability to permit preferential permeation therethrough of water from a mixture of water and alcohol. When the mixture of water and alcohol is disposed on one side of this membrane and the space on the other side of the membrane is vacuumized, the water from the mixture preferentially permeates through the membrane and the alcohol concentration in the mixture proportionately increases.
    Type: Grant
    Filed: February 3, 1988
    Date of Patent: April 11, 1989
    Assignees: Agency of Industrial Science & Technology, Ministry of International Trade & Industry
    Inventors: Toshihiro Hirotsu, Shigeru Nakajima