Patents by Inventor Yeong-Chung E. Lien

Yeong-Chung E. Lien 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).

  • Electronic rule for precise distance measurement and distance setting
    Patent number: 4158229
    Abstract: An instrument for precise measurement and setting of distances has an electronically controlled scale comprising optically active elements, an electronically controlled digital display, and a keyboard. The display and keyboard are mechanically rotatable and connected by electronic circuitry including a microprocessor. The light scale provides optical indicia, including a reference point and a cursor, having positions which are determined by keyboard entries and are displayed numerically.
    Type: Grant
    Filed: June 24, 1977
    Date of Patent: June 12, 1979
    Inventors: John Woo, Jr., Yeong-Chung E. Lien