Patents by Inventor Earl D. Johnston

Earl D. Johnston 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).

  • Vent pipe cover
    Patent number: 4206692
    Abstract: A cover for vent pipes rising from building roofs is formed from a unitary initially flat blank which can be bent to fit around the vent pipe snugly and securely with locking tabs provided to hold the cover in place and stabilize it on the vent pipe. Debris is excluded from the open vent pipe without interference with its ventilating action.
    Type: Grant
    Filed: March 27, 1979
    Date of Patent: June 10, 1980
    Inventor: Earl D. Johnston