Patents by Inventor Donald R. McCallum

Donald R. 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).

  • Portable stage
    Patent number: 6393769
    Abstract: A portable stage having at least a transport configuration and a deployed configuration is disclosed. The portable stage includes a chassis having wheels rotatably attached thereto and a main floor panel attached to the chassis. First and second deployable floor panels are pivotally attached to the main floor panel, and a deployable canopy is attached to the chassis. The deployable canopy is stored between the first and second floor panels when the portable stage is in its transport configuration. When the stage is deployed, the main floor panel, first floor panel and second floor panel form a main stage, and the canopy is large enough to cover the main stage.
    Type: Grant
    Filed: March 24, 2000
    Date of Patent: May 28, 2002
    Assignee: Marshall Austin Productions
    Inventors: Roy M. Mertik, Donald R. McCallum, Donald J. McCallum
  • Mobile stage
    Patent number: D672054
    Type: Grant
    Filed: June 14, 2010
    Date of Patent: December 4, 2012
    Assignee: Marshall Austin Productions, Inc.
    Inventors: Roy M. Mertik, Donald R. McCallum, Donald J. McCallum