Patents by Inventor Roberto Jose Frey

Roberto Jose Frey 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).

  • Carburetor circuit for internal combustion engines
    Patent number: 4052489
    Abstract: The intake manifold of a carburetor of an internal combustion engine has between its air inlet end and its discharge end a throat portion and a butterfly valve adjacent the discharge end. First fuel injection means communicate with the interior of the manifold in the region of the throat portion for injection of fuel into the latter during normal operation of the engine, and second fuel injection means communicate with the interior of the manifold above and closely adjacent the butterfly valve for injecting additional fuel into the latter during acceleration of the engine.
    Type: Grant
    Filed: April 12, 1976
    Date of Patent: October 4, 1977
    Inventor: Roberto Jose Frey