Patents by Inventor Joseph Yung-Chang Chu

Joseph Yung-Chang Chu 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: 4055424
    Abstract: Microfilm structures of improved contrast are provided by coating a suitable transparent film substrate with an intermediate layer of a silicone elastomer which is abhesive to ink, coating said silicone with a surface layer of a photosensitive polymer which when exposed to activating electromagnetic radiation cross-links and chemically attaches to said silicone elastomer to form oleophilic ink accepting image areas, imagewise exposing said photosensitive polymer, removing the non-exposed, light sensitive polymer to form non-imaged areas of the abhesive silicone elastomer, and selectively inking the oleophilic image areas to form an imaged microfilm structure of improved image density and contrast.
    Type: Grant
    Filed: May 7, 1976
    Date of Patent: October 25, 1977
    Assignee: Xerox Corporation
    Inventors: Joseph Yung-Chang Chu, Richard Louis Schank