Patents by Inventor Carl L. Hardee

Carl L. Hardee 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).

  • Dust-tight hatch closure assembly
    Patent number: 4469152
    Abstract: A dust-tight hatch closure assembly for filling railway covered hopper cars having a filling means and a pneumatic seal in the form of an inflatable annulus.
    Type: Grant
    Filed: October 25, 1979
    Date of Patent: September 4, 1984
    Assignee: Borg-Warner Chemicals, Inc.
    Inventors: Carl L. Hardee, Robert E. Wagner
  • Hatch cover with pneumatic seal for mobile or stationary storage tanks
    Patent number: D271789
    Type: Grant
    Filed: June 2, 1981
    Date of Patent: December 13, 1983
    Assignee: Borg-Warner Chemicals, Inc.
    Inventors: Carl L. Hardee, Robert E. Wagner