Patents by Inventor Alfred T. Townley

Alfred T. Townley 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).

  • Switch circuit for setting and signaling a voltage level
    Patent number: 5428640
    Abstract: A switch circuit is disclosed which both sets the voltage at an output terminal and signals that the voltage has been set. The switch circuit may be implemented with a single-pole single-throw switch. A voltage drop device, connected in parallel with the switch, is used to generate the output voltage levels. The switch circuit is also suitable for enabling and disabling the heartbeat signal generated by a local area network transceiver and for signaling whether the heartbeat signal has been enabled by lighting a light-emitting diode.
    Type: Grant
    Filed: October 22, 1992
    Date of Patent: June 27, 1995
    Assignee: Digital Equipment Corporation
    Inventor: Alfred T. Townley
  • Collison detection and signaling circuit
    Patent number: 5267237
    Abstract: A process and a circuit are described for detecting collisions between packets being transmitted over a network and signaling the detection of collisions. Peak-detection is used to facilitate the detection of collisions. Embodiments of the process and circuit may also include the detection and signaling of packet transmissions by a transceiver coupled to the network. In a preferred embodiment, the detection of collisions and transmissions are signaled by the lighting of a corresponding light-emitting diode for at least a minimum duration.
    Type: Grant
    Filed: July 7, 1992
    Date of Patent: November 30, 1993
    Assignee: Digital Equipment Corporation
    Inventor: Alfred T. Townley