Patents by Inventor Michelle M. Bray

Michelle M. Bray 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).

  • Encryption key management
    Patent number: 5412722
    Abstract: A key management system permits a high degree of autonomous rekeying activity by communication units (105) in a secure communication system (100). Responsive to time reference information transmitted by a key management controller (101), the communication units (105) activate a designated key index at a predetermined activation time. If conditions so indicate, a communication unit may transmit a rekey request.
    Type: Grant
    Filed: August 31, 1993
    Date of Patent: May 2, 1995
    Assignee: Motorola, Inc.
    Inventors: Mark J. Sherly, Hans C. Sowa, Michelle M. Bray
  • Encryption and decryption of chained messages
    Patent number: 5161189
    Abstract: A single sync field (501) and multiple messages or message segments (503, 507, 511, and 515) are chained (407) together and encrypted (407) as a whole. When this encrypted chained message is received, it is decrypted as a whole (605), or in part (613) by setting up (609) and filling (611) a holding register with the encryption state of the encrypting device.
    Type: Grant
    Filed: March 11, 1991
    Date of Patent: November 3, 1992
    Assignee: Motorola, Inc.
    Inventors: Michelle M. Bray, Michael W. Bright, Hans C. Sowa
  • Method and apparatus for time companding a digital voice signal
    Patent number: 4893308
    Abstract: Disclosed is a method and apparatus for time companding a digital voice signal wherein, single bits are periodically removed from the digital voice signal, which is then compressed thereby forming a contiguous area of removed bits. A synchronization signal is inserted into this area and the combined signal is transmitted. At the receiver, the synchronization signal is extracted and is used to synchronize the receiver. The digital voice signal is then expanded and the removed bits are predicted and replaced.
    Type: Grant
    Filed: September 3, 1986
    Date of Patent: January 9, 1990
    Assignee: Motorola, Inc.
    Inventors: Alan L. Wilson, Michael W. Bright, Michelle M. Bray, Eric F. Ziolko, David L. Weiss
  • Secure communication system
    Patent number: 4893339
    Abstract: Disclosed is a synchronous secure communication system wherein an information signal is encrypted in an encryption means. The encrypted signal is compressed to allow the insertion of a synchronization signal, and the combined signals are transmitted. At the receiver, the synchronization signal is extracted and used to synchronize the receiver to the incoming data stream thereby improving receiver sensitivity and range.
    Type: Grant
    Filed: September 30, 1986
    Date of Patent: January 9, 1990
    Assignee: Motorola, Inc.
    Inventors: Michael W. Bright, Eric F. Ziolko, Alan L. Wilson, Michelle M. Bray, Harry A. Hennen, David L. Weiss