Patents by Inventor James I. Bartles

James I. Bartles 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).

  • Fluid level detector test switch
    Patent number: 4224606
    Abstract: A fluid level control circuit with a safety test function for a boiler water level probe of a fail safe type is connected to a field effect transistor controlled amplifier having a well defined threshold of operation. A safety test switch means is provided to pull the amplifier's input down below the threshold point, but not to a shorted condition. By observing the output of the system it is possible to determine whether the fluid level detector is properly installed, and whether the amplifier has had any type of unsafe operating failure.
    Type: Grant
    Filed: March 21, 1979
    Date of Patent: September 23, 1980
    Assignee: Honeywell Inc.
    Inventor: James I. Bartles