Patents by Inventor I-En Tsai

I-En Tsai 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).

  • Dot matrix hologram with a hidden image
    Patent number: 6392768
    Abstract: A dot matrix hologram with a hidden image is disclosed, wherein the hidden image technology is applied to a dot matrix hologram. Although the hidden image technology has been used in a conventional hologram, it has not been used in a dot matrix hologram. Although the above two kinds of hologram both can show hidden images with illuminating laser light, the disclosed dot matrix hologram with a hidden image and the conventional hologram with a hidden image use different working principles and have different detailed characteristics to create hidden image regions.
    Type: Grant
    Filed: September 16, 1999
    Date of Patent: May 21, 2002
    Assignee: Ahead Optoelectronics, Inc.
    Inventors: Sheng-Lie Yeh, I-En Tsai, Hsiu-Hung Lin