Patents Represented by Attorney Donna R. Maddox

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  • Apparatus and method for generating a data signal
    Patent number: 5554988
    Abstract: An apparatus is provided for generating a multiple-level amplitude modulated data signal. The circuit provides accurate data signal level control while minimizing transient errors. A controlling level, relative to an analog reference level is provided. Multiple bit reference levels are generated from the controlling level and analog reference level. A method is provided for selecting one of the reference levels.
    Type: Grant
    Filed: August 23, 1994
    Date of Patent: September 10, 1996
    Assignee: Motorola, Inc.
    Inventors: Michael H. Retzer, Alan D. Muehlfeld
  • Touchscreen stylus
    Patent number: D356306
    Type: Grant
    Filed: June 17, 1993
    Date of Patent: March 14, 1995
    Assignee: Motorola
    Inventors: Roger W. Ady, Frank Gazzano, Edward A. Cline
  • Antenna for portable communicator/computer
    Patent number: D357683
    Type: Grant
    Filed: July 2, 1993
    Date of Patent: April 25, 1995
    Assignee: Motorola
    Inventors: Edward A. Cline, Harold J. Gorenz, Jr., Charles D. Hood, III, Daniel K. Harden, Mark B. Friesen, Gary D. Schulz