Patents by Inventor Kuo-Cheng Chuan

Kuo-Cheng Chuan 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).

  • Mixed mode photomask for nikon stepper
    Patent number: 5948572
    Abstract: A mixed mode photo-mask for a stepper. Both alignment marks of 15 mm.times.15 mm and alignment marks of 20 mm.times.20 mm are tooled on the photo mask. The photo mask further comprises a reticle glass plate, a chrome border with a pattern to be transferred, and a pellicle.
    Type: Grant
    Filed: January 20, 1998
    Date of Patent: September 7, 1999
    Assignee: United Microelectronics Corp.
    Inventors: Chih-Chiang Liu, Kuo-Cheng Chuan