Patents by Inventor Norman J. Hannigan

Norman J. Hannigan 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).

  • Patent number: 4398923
    Abstract: An improved access port structure for a vessel, such as a coal gassification furnace, in which a closure member is mounted for movement, on the vessel to open or close an opening, a means of providing a steam vortex flowing into the opening to prevent the escape of gases from the vessel, and an interconnection to the steam supply to assure that the vortex is operating prior to the opening of the closure member.
    Type: Grant
    Filed: April 19, 1982
    Date of Patent: August 16, 1983
    Assignee: BS&B Engineering Company, Inc.
    Inventor: Norman J. Hannigan