Patents by Inventor Ho-Lun Lee

Ho-Lun Lee 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).

  • Patent number: 4673454
    Abstract: An improved bipolar membrane, a precursor for said membrane and a process for preparing bipolar membranes and precursors are described. In the process a precursor is formed by laminating at least two polymeric layers at least one of which is non-ionic. After the formation of the precursor, the non-ionic layer or layers are chemically treated to form a stable bipolar membrane having high permselectivity and low potential drop. The novel bipolar membrane contains an interfacial layer having anionic and cationic domains.
    Type: Grant
    Filed: September 9, 1985
    Date of Patent: June 16, 1987
    Assignee: Chinese Petroleum Corp.
    Inventors: Kang-Jen Liu, Ho-Lun Lee
  • Patent number: 4584246
    Abstract: An improved bipolar membrane, a precursor for said membrane and a process for preparing bipolar membranes and precursors are described. In the process a precursor is formed by laminating at least two polymeric layers at least one of which is non-ionic. After the formation of the precursor, the non-ionic layer or layers are chemically treated to form a stable bipolar membrane having high permselectivity and low potential drop. The novel bipolar membrane contains an interfacial layer having anionic and cationic domains.
    Type: Grant
    Filed: November 23, 1983
    Date of Patent: April 22, 1986
    Assignee: Chinese Petroleum Corp.
    Inventors: Kang-Jen Liu, Ho-Lun Lee
  • Patent number: 4299825
    Abstract: This invention provides a process for clarifying and concentrating Xanthomonas heteropolysaccharide fermentation broth, which process includes filtration and ultrafiltration steps.A clarified and concentrated xanthan gum solution of the present invention contains between about 8-15 weight percent xanthan gum, and exhibits a viscosity in the range of 15,000-30,000 centipoises, and a light transmittance of greater than 5 percent as measured by a colorimeter.
    Type: Grant
    Filed: July 3, 1980
    Date of Patent: November 10, 1981
    Assignee: Celanese Corporation
    Inventor: Ho-Lun Lee