Patents by Inventor Michael Marro

Michael Marro 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).

  • Power measuring apparatus
    Patent number: 4314201
    Abstract: Power measuring apparatus for electric appliances including interconnected male and female connectors for attachment to a source of power and to an appliance to be measured, a transformer having a primary winding in series with one of the conductors interconnecting the connectors, a potentiometer having a resistance element connected with the secondary winding on said transformer and a movable contactor, and an indicator connected between the contactor and one end of the resistance element, the potentiometer being calibrated in terms of cost per kilowatt-hour and the indicator being calibrated in terms of cost per hour.
    Type: Grant
    Filed: April 14, 1980
    Date of Patent: February 2, 1982
    Assignee: Dynamic Instrument Corporation
    Inventors: Michael Marro, John Monin