Patents by Inventor Don Gramling

Don Gramling 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).

  • Device for verifying the wiring of an electrical receptacle for a towed vehicle
    Patent number: 5414362
    Abstract: A device for testing a multi-terminal electrical service receptacle on a towing vehicle includes an electrically insulative body of elongated shape having forward and rearward faces. Electrical contacts are disposed in the forward face to engage the terminals of the receptacle. Light-emitting devices such as bulbs are disposed in the rearward face, and are connected by way of electrical conductors to the corresponding contacts in the forward surface. During use of the device, the illumination of a particular light signifies the validity of the corresponding electrical circuit involving features of the towing vehicle.
    Type: Grant
    Filed: January 18, 1994
    Date of Patent: May 9, 1995
    Inventors: Don Gramling, L. T. Botkins
  • Water heater thermostat wrench
    Patent number: D359210
    Type: Grant
    Filed: May 2, 1994
    Date of Patent: June 13, 1995
    Inventor: Don Gramling
  • Water heater thermostat wrench
    Patent number: D359667
    Type: Grant
    Filed: May 2, 1994
    Date of Patent: June 27, 1995
    Inventor: Don Gramling