Patents by Inventor R. Bruce McCallum

R. Bruce McCallum 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).

  • Patent number: 4108275
    Abstract: The improved engine exhaust gas muffler of the invention comprises an outer hollow tubular elongated shell having a gas inlet and a gas outlet at opposite ends thereof, and a hollow perforated tubular extension secured to the inlet end of the shell and extending part way along the length of the shell substantially coaxially therewith. A hollow perforated insert substantially coaxial with the shell and having an upstream end slip fitted within the downstream end of the extension and a downstream end either connected to the shell gas outlet or fitted within a lower extension is also provided. The insert's upstream end has a terminal portion of smaller diameter than the main body of the insert so as to form with the extension downstream end means for diverting exhaust gases flowing through the muffler into a plurality of paths for better sound attenuation, and also a pocket for the accumulation of solid particles from exhaust gases without plugging of said paths.
    Type: Grant
    Filed: May 31, 1977
    Date of Patent: August 22, 1978
    Inventors: William M. Black, R. Bruce McCallum