Patents by Inventor Russell A. Bergum

Russell A. Bergum 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).

  • Method and apparatus for improved security within encrypted communication devices
    Patent number: 5457748
    Abstract: Within a communication device which utilizes digital encryption, volatile and non-volatile memory devices are used for the storage of encryption keys in unencrypted and encrypted form, respectively. A power sensing circuit, in conjunction with tamper detection circuitry, is used to help ensure the active erasure of keys from the volatile memory in the event of a non-secure operating condition.
    Type: Grant
    Filed: November 30, 1992
    Date of Patent: October 10, 1995
    Assignee: Motorola, Inc.
    Inventors: Russell A. Bergum, Janes A. Van Bosch
  • Method and apparatus of controlling processing devices during power transition
    Patent number: 5249227
    Abstract: A voltage sensing circuit is used to determine when the current supply to a processing unit is under transition. During power up transitions, the voltage sensing circuit allows the processing unit to reset normally. During power down transitions, the voltage sensing circuit prevents the processing unit from resetting until a predetermined procedure has been completed, thereby assuring an orderly shutdown.
    Type: Grant
    Filed: November 30, 1992
    Date of Patent: September 28, 1993
    Assignee: Motorola, Inc.
    Inventors: Russell A. Bergum, James A. Van Bosch