Patents by Inventor Dewitt Ong

Dewitt Ong 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).

  • Dual mode track and hold drivers for active LCD'S
    Patent number: 5440256
    Abstract: A track and hold signal processing system is capable of driving 256 gray scale active matrix LCD displays at speeds limited only by the electrical characteristics of the display. The quiescent power dissipated by the system is substantially less than known track and hold drivers due to separation of the tracking circuit from the hold circuit resulting in optimization of the tracking function.
    Type: Grant
    Filed: November 17, 1992
    Date of Patent: August 8, 1995
    Assignee: Medtronic, Inc.
    Inventors: Richard A. Erhart, DeWitt Ong
  • Architecture modification for improved ROM security
    Patent number: 4843026
    Abstract: A technique of modifying a ROM mask to prevent external access of internal memory of an integrated circuit device. Patterns in the ROM mask are altered to permit implantation of components of a driver circuit such that these driver circuits are disabled. Disabling of the driver circuit prevents control signals from permitting external access of internal memory, therein allowing copy protection of the contents of the internal memory.
    Type: Grant
    Filed: September 24, 1987
    Date of Patent: June 27, 1989
    Assignee: Intel Corporation
    Inventors: Dewitt Ong, Scott Rider