Patents by Inventor John B. McDonough

John B. McDonough 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).

  • Gas filter
    Patent number: 4365981
    Abstract: A gas filter is formed from two uniformly spaced nesting screens extending along a serpentine path, with the space between them filled with granular filtering material. Each screen has laterally spaced areas curved in one direction lengthwise of the serpentine path and alternating with laterally spaced areas curved in the opposite direction and integrally joined thereto to thereby provide the screen with a continuous curvature from end to end of the serpentine path.
    Type: Grant
    Filed: July 1, 1981
    Date of Patent: December 28, 1982
    Assignee: Mine Safety Appliances Company
    Inventor: John B. McDonough