Patents by Inventor Bruce D. Spivack

Bruce D. Spivack 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).

  • Process for surface modified hollow microspheres
    Patent number: 4411847
    Abstract: Non-fused hollow glass microspheres that consist primarily of silicate are rendered more water-resistant by treatment with multivalent metals. The hollow microspheres are slurried with water and then a solution of a multivalent metal salt such as Al.sub.2 (SO.sub.4).sub.3 is added to the slurry. The rate of the addition is controlled so that the pH can be regulated. Separating, washing and drying complete the preparation.
    Type: Grant
    Filed: May 27, 1982
    Date of Patent: October 25, 1983
    Assignee: PQ Corporation
    Inventors: David I. Netting, Bruce D. Spivack, James P. Cunnion, Jr.
  • Spray-dried hollow fibers
    Patent number: 4361624
    Abstract: Hollow fibers are prepared by spray drying a solution of a film-former in a volatile solvent. The viscosity of the solution must be 1.5 to 10 times the viscosity that usually results in spheres or microspheres. The preferred film-forming substance is a combination of sodium silicate and a "polysalt.
    Type: Grant
    Filed: January 22, 1981
    Date of Patent: November 30, 1982
    Assignee: PQ Corporation
    Inventor: Bruce D. Spivack
  • Surface modified hollow microspheres
    Patent number: 4340642
    Abstract: Non-fused hollow glass microspheres that consist primarily of silicate are rendered more water-resistant by treatment with multivalent metals. The hollow microspheres are slurried with water and then a solution of a multivalent metal salt such as Al.sub.2 (SO.sub.4).sub.3 is added to the slurry. The rate of the addition is controlled so that the pH can be regulated. Separating, washing and drying complete the preparation.
    Type: Grant
    Filed: June 20, 1980
    Date of Patent: July 20, 1982
    Assignee: PQ Corporation
    Inventors: David I. Netting, Bruce D. Spivack, James P. Cunnion, Jr.