Patents by Inventor Dale M. Kornfeld

Dale M. Kornfeld 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: 4247434
    Abstract: Monodisperse latexes having a particle size in the range of 2 to 40 microns are prepared by seeded emulsion polymerization in microgravity. A reaction mixture containing smaller monodisperse latex seed particles, predetermined amounts of monomer, emulsifier, initiator, inhibitor and water is placed in a microgravity environment, and polymerization is initiated by heating. The reaction is allowed to continue until the seed particles grow to a predetermined size, and the resulting enlarged particles are then recovered. A plurality of particle-growing steps can be used to reach larger sizes within the stated range, with enlarged particles from the previous steps being used as seed particles for the succeeding steps. Microgravity enables preparation of particles in the stated size range by avoiding gravity-related problems of creaming and settling, and flocculation induced by mechanical shear that have precluded their preparation in a normal gravity environment.
    Type: Grant
    Filed: December 29, 1978
    Date of Patent: January 27, 1981
    Inventors: Alan M. Administrator of the National Aeronautics and Space Administration, with respect to an invention of Lovelace, John W. Vanderhoff, Fortunato J. Micale, Mohamed S. El-Aasser, Dale M. Kornfeld