Patents by Inventor Bruce K. McGillvray

Bruce K. McGillvray 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).

  • Pyramid pipe
    Patent number: 4071035
    Abstract: An apparatus for the double filtering of tobacco smoke by water or other suitable liquid. The apparatus is provided with two vertically arranged chambers, the lower chamber, for carrying the filtering liquid, being in communication with the upper chamber by means of riser tubes. The apparatus includes a tobacco carrying bowl exterior of the apparatus and in communication with the bottom of the lower chamber and including a mouthpiece exterior of the apparatus and in communication with the upper chamber.
    Type: Grant
    Filed: October 1, 1976
    Date of Patent: January 31, 1978
    Inventors: Cecil E. Boyd, Bruce K. McGillvray