Patents by Inventor John R. Mulkey

John R. Mulkey 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).

  • Tank shoe spring and double seal
    Patent number: 5515989
    Abstract: The space saving double seal uses a lower shoe, an upper shoe and a pair of vapor barriers joining them to a conventional outer rim plate on a floating roof. The secondary vapor barrier extends from the outer rim plate to the top of the upper shoe. A pair of pusher springs maintain the shoes against the tank's inner wall. The invention provides for liquid storage to the full height which the floating roof allows. Additionally an improved primary and/or secondary shoe leaf spring and pusher brace combination improves the seal between the shoe and the inner wall.
    Type: Grant
    Filed: February 9, 1994
    Date of Patent: May 14, 1996
    Assignee: Tanco Engineering, Inc.
    Inventors: Jack G. Petrie, John R. Mulkey
  • Space saving double seal
    Patent number: 5284269
    Abstract: The space saving double seal uses a lower shoe, an upper shoe and a pair of vapor barriers joining them to a conventional outer rim plate on a floating roof. The secondary vapor barrier extends from the outer rim plate to the top of the upper shoe. A pair of pusher springs maintain the shoes against the tank's inner wall. The invention provides for liquid storage to the full height which the floating roof allows.
    Type: Grant
    Filed: June 28, 1993
    Date of Patent: February 8, 1994
    Inventors: Jack G. Petrie, John R. Mulkey