Patents by Inventor John Franz CHRISTENSEN

John Franz CHRISTENSEN 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).

  • METHOD AND APPARATUS FOR SYNCHRONIZATION OF ACTIONS IN A PARALLEL UPS SYSTEM USING A SERIAL COMMUNICATIONS BUS
    Publication number: 20090009001
    Abstract: A serial communications bus is utilized to send key action data between parallel UPS units. The communications bus is used to transmit data at the zero crossing of the critical bus voltage. Each UPS unit then takes action based upon the event data received at the next zero crossing of the critical bus voltage.
    Type: Application
    Filed: July 5, 2007
    Publication date: January 8, 2009
    Applicant: LIEBERT CORPORATION
    Inventors: Mohammad Nanda Rahmana MARWALI, Kevin Kim ESCHHOFEN, John Franz CHRISTENSEN, Brian Paul HEBER