Patents Examined by S. J. Emery
  • Method of producing single crystals of semiconductor material by floating-zone melting
    Patent number: 3935059
    Abstract: In a floating-zone melting process for producing single crystals of a semi-conductor material from a semi-conductor rod and a seed crystal, the rod is heated by high-frequency induction from an inductance coil which is spaced from a short-circuited annular conductor. The spacing between the inductance coil and the short-circuited conductor is varied during passage of the molten zone to correspond with variations in the diameter of the growing crystal.
    Type: Grant
    Filed: June 28, 1972
    Date of Patent: January 27, 1976
    Assignee: U.S. Philips Corporation
    Inventor: Michel Ayel
  • Aluminum nitride single crystal growth from a molten mixture with calcium nitride
    Patent number: 3933573
    Abstract: A method for growing single crystals which utilizes calcium nitride as a solvent system in the molten solution growth of bulk aluminum nitride crystals.
    Type: Grant
    Filed: March 27, 1975
    Date of Patent: January 20, 1976
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventor: Cortland O. Dugger
  • Forming highly absorbent, low bulk density sodium silicate by contacting with H.sub.2 O.sub.2 and heating to about 45.degree. to 60.degree.C
    Patent number: 3932140
    Abstract: Spheroidal aggregates of highly absorbent, low bulk density, readily soluble, high surface area, hydrated, amorphous alkali metal silicate are provided by contacting discrete alkali metal silicate particles with an aqueous solution of hydrogen peroxide, absorbing the peroxide into the alkali metal silicate hydrated structure and heating the silicate to destroy substantially all of the hydrogen peroxide.
    Type: Grant
    Filed: May 22, 1974
    Date of Patent: January 13, 1976
    Assignee: E. I. Du Pont de Nemours & Co.
    Inventors: Madhusudan D. Jayawant, Paul C. Yates
  • Serial flow crystallization at linearly decreasing pressures
    Patent number: 3932142
    Abstract: A process and apparatus for obtaining crystals of a particular substance from a flowing solution thereof, by supplying the seeding crystals to one n.sup.th portion of the saturated solution and supplying one n.sup.th portion of the solution to the crystalliser further downstream at each of (n-1) places. The supersaturation of the solution is maintained at the required value by keeping the static pressure so low that self-vaporisation occurs, whereas this static pressure is caused to drop gradually in the crystalliser from its inlet end toward its discharge end.
    Type: Grant
    Filed: November 1, 1972
    Date of Patent: January 13, 1976
    Assignees: Stork Werkspoor Sugar B.V., Suiker Unie Holding B.V.
    Inventors: Gerbertus H. DE Vries, Gerrit C. DE Bruyn