Patents by Inventor William A. Rowell

William A. Rowell 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).

  • Aquarium heater
    Patent number: 4889973
    Abstract: An aquarium heater which consists of a heater pad attached to the outside bottom surface of the aquarium. The heater pad uses an etched-foil heating element laminated between layers of insulating material. Normally, the heat is attached to the bottom of the tank using a pressure sensitive adhesive. The aquarium water temperature is maintained using a current limiting electronic controller and a thermistor for sensing temperature. The thermistor is located in the heater pad between the two layers of insulation.
    Type: Grant
    Filed: October 12, 1988
    Date of Patent: December 26, 1989
    Inventors: Michael F. Farinacci, William A. Rowell