Patents by Inventor Charles C. Tai

Charles C. Tai 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).

  • Corrective lens for copying books
    Patent number: 6665128
    Abstract: An improved corrective lens for copying pages of a book pressed flat upon a document support glass of a xerographic copying machine or document scanner. The corrective lens is shaped to fit in the space between the book pages to be copied and the document glass of the copier. The corrective lens has a pyramidal center extending into the crease of a typical book. The lens extends outwardly from the pyramidal center to form substantially flat side portions that hold the pages of the open book in place.
    Type: Grant
    Filed: July 23, 2002
    Date of Patent: December 16, 2003
    Inventor: Charles C. Tai
  • Corrective lens for copying books
    Patent number: 6313954
    Abstract: A corrective lens for copying pages of a book pressed flat upon a document support glass of a xerographic copying machine or document scanner. The corrective lens is shaped to fit in the space between the book pages to be copied and the document glass of the copier. The corrective lens has a pyramidal center extending into the crease of a typical book. The lens extends outwardly from the pyramidal center to form substantially flat side portions that hold the pages of the open book in place.
    Type: Grant
    Filed: February 28, 2000
    Date of Patent: November 6, 2001
    Inventor: Charles C. Tai