Patents by Inventor John A. Johnston

John A. Johnston 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).

  • Patent number: 8165109
    Abstract: A voice over Internet protocol (VoIP) system and more particularly, an improved VoIP system serving a distributed group of teleagents. Network parameters that affect voice quality over broadband connections are rapidly detected by generating both detected and subjective alerts when problems with the quality of a IP telephone connection are detected and correcting the detected problems. Network parameters are monitored during an actual VoIP telephone call or by using synthetic traffic. If the voice quality degrades for a particular teleagent, the teleagent is removed from the pool of available agents until voice quality improves. Alternatively, the voice quality of each teleagent may be ranked according to the service provided.
    Type: Grant
    Filed: November 10, 2004
    Date of Patent: April 24, 2012
    Assignee: Cisco Technology, Inc.
    Inventors: Joel W. King, John A. Johnston, Steve H. Schubert
  • Patent number: 5055188
    Abstract: Apparatus for the control of Protistal growth in distillates including a flow path through which the hydrocarbon distillate is caused to flow, and a magnet assembly for producing a magnetic field in or about the flow path so that distillate flowing through the flow path is passed circuitously through the magnetic field.
    Type: Grant
    Filed: November 1, 1989
    Date of Patent: October 8, 1991
    Assignee: Debug Filters Limited
    Inventors: John A. Johnston, Lindsay W. Forrest, Colin P. Wickham