Patents by Inventor Richard D. Marshal

Richard D. Marshal 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).

  • Blower unit for breathing mask
    Patent number: D687944
    Type: Grant
    Filed: April 30, 2010
    Date of Patent: August 13, 2013
    Assignee: Scott Health & Safety Ltd.
    Inventors: Albert F. Zwolinsky, Christopher G. Hall, Richard D. Marshal, Sally Leyland, Robert Carr, Frank Angear