Patents by Inventor Gary E. Robertson

Gary E. Robertson 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).

  • Switchable active termination for SCSI peripheral devices
    Patent number: 5422580
    Abstract: A switchable active termination device internally mounted within a peripheral device and electrically connected to the end of a Small Computer Systems Interface (SCSI) bus cable. Through use of a pair of SCSI active terminator circuit chips, the termination device actively terminates the data lines of the bus cable in a first operating mode in response to a first digital command by providing precise resistive pull-up to a predetermined value on each data line. In a second mode of operation responsive to a second digital command, the termination device disconnects all terminating resistors. Activation of the termination modes is logically driven from an included switch, with visual indication of the presence of an active termination state provided by a light emitting diode.
    Type: Grant
    Filed: October 14, 1993
    Date of Patent: June 6, 1995
    Assignee: APS Technologies
    Inventors: Paul G. Mandel, Richard A. Ralston, Jr., Gary E. Robertson
  • Spot and seam welding machine controller
    Patent number: D346611
    Type: Grant
    Filed: February 28, 1992
    Date of Patent: May 3, 1994
    Assignee: Eron Corporation
    Inventors: C. R. Hodge, Gary E. Robertson
  • Switchable active termination for SCSI peripheral devices
    Patent number: RE36789
    Abstract: A switchable active termination device internally mounted within a peripheral device and electrically connected to the end of a Small Computer Systems Interface (SCSI) bus cable. Through use of a pair of SCSI active terminator circuit chips, the termination device actively terminates the data lines of the bus cable in a first operating mode in response to a first digital command by providing precise resistive pull-up to a predetermined value on each data line. In a second mode of operation responsive to a second digital command, the termination device disconnects all terminating resistors. Activation of the termination modes is logically driven from an included switch, with visual indication of the presence of an active termination state provided by a light emitting diode.
    Type: Grant
    Filed: July 29, 1996
    Date of Patent: July 25, 2000
    Assignee: La Cie, Limited
    Inventors: Paul G. Mandel, Richard A. Ralston, Jr., Gary E. Robertson