Patents by Inventor Walter Hallam

Walter Hallam 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).

  • Six-sided exhaust stack
    Patent number: D718691
    Type: Grant
    Filed: June 18, 2013
    Date of Patent: December 2, 2014
    Inventors: Walter Hallam, Nicholas Dvorak
  • Eight-sided exhaust stack
    Patent number: D725016
    Type: Grant
    Filed: August 23, 2013
    Date of Patent: March 24, 2015
    Inventors: Walter Hallam, Nicholas Dvorak