Patents by Inventor John V. Erlandson

John V. Erlandson 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).

  • Apparatus for protecting electronic equipment powered from a marine power source
    Patent number: 5172292
    Abstract: A device and method for protecting D.C. powered electronic equipment to be isolated from a D.C. marine power source for minimizing the interference of extraneous signals on the power signals along with a back-up D.C. power source for powering the electronic equipment in the event of the loss of operative power signals from the D.C. source. The device may include a remote indicator for signalling the marine vessel operator that the electronic equipment is being powered from the back-up power source and not the main power source.
    Type: Grant
    Filed: January 18, 1990
    Date of Patent: December 15, 1992
    Assignee: ROI Development Corp. dba NEWMAR
    Inventors: John V. Erlandson, John R. Johnson