Patents by Inventor Donald R. Janninck

Donald R. Janninck 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).

  • Highly efficient calcination of gypsum to hemihydrate
    Patent number: 4744963
    Abstract: Hydrodynamic pumping of the fluidized calcining mass in a kettle is set up by the continuous flow of the mass to and from heating rods immersed therein which are constantly emitting at least about 1 British Thermal Unit of heat per minute per square inch of the surface of the rods. The transfer of heat from the walls and bottom of the kettle is enhanced so that more of the available heat is actually absorbed than in a kettle lacking such heating rods. The rate of calcination may be increased while the rate of heat input is decreased.
    Type: Grant
    Filed: August 14, 1986
    Date of Patent: May 17, 1988
    Assignee: United States Gypsum Company
    Inventors: Otto L. Dozsa, Donald R. Janninck, Richard F. Stone, Larbi Bounini
  • Apparatus for the production of mineral fibers by means of rotating discs
    Patent number: 4397623
    Abstract: An apparatus for producing mineral fibers comprising a container having means for heating the mineral material to form a molten pool therein, a plurality of discs having a portion thereof immersed in the molten pool, and means for rotating the discs in the same angular direction at high speed. In a preferred embodiment means are provided for moving a gas such as air or steam across the edges of the rotating discs to assist in the attenuation of the fibers.
    Type: Grant
    Filed: March 2, 1981
    Date of Patent: August 9, 1983
    Assignee: United States Gypsum Company
    Inventors: William F. Porter, Donald R. Janninck