Patents by Inventor Zhihua Cai

Zhihua Cai 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).

  • Hydrophilic microporous polyolefin membrane
    Patent number: 5209849
    Abstract: A hydrophilic microporous membrane, is provided comprising a hydrophobic membrane substrate exemplified by a polyolefin or partially fluorinated polyolefin membrane. A process is also provided for preparing a hydrophilic membrane by grafting a water soluble polymer to the hydrophobic membrane substrate surface by irradiation means, e.g., ultraviolet irradiation. The invention further concerns a method for making the membrane and process means for filtering a fluid through such membrane.
    Type: Grant
    Filed: April 24, 1992
    Date of Patent: May 11, 1993
    Assignee: Gelman Sciences Inc.
    Inventors: Hopin Hu, Zhihua Cai