Patents by Inventor Otto L. Dozsa

Otto L. Dozsa 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
  • Accelerator for gypsum plaster and process of manufacture
    Patent number: 4681644
    Abstract: A setting accelerator for calcined gypsum plaster and a process for its preparation are disclosed. The accelerator comprises finely ground calcium sulfate dihydrate having composite coatings on the particles of firstly a calcination inhibiting material such as sugar and secondly a coating of aluminum sulfate hydrate. The accelerator is particularly useful in the formation of gypsum wallboard.
    Type: Grant
    Filed: September 27, 1985
    Date of Patent: July 21, 1987
    Assignee: USG Corporation
    Inventor: Otto L. Dozsa