Patents by Inventor Robert G. Grandi

Robert G. Grandi 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).

  • Porcupine wire coil electric resistance fluid heater
    Patent number: 4207457
    Abstract: A porcupine wire coil of electric resistance wire is positioned in a tube having an electrically insulating inside in which the peaks or looped ends of the coil convolutions are embedded so as to hold the coil convolutions spaced from each other. When the coil is energized, fluid flowed through the tube can be heated.
    Type: Grant
    Filed: June 29, 1978
    Date of Patent: June 10, 1980
    Assignee: The Kanthal Corporation
    Inventors: John H. Haglund, Robert G. Grandi