Patents by Inventor Robert W. Spencer

Robert W. Spencer 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).

  • Method of underwater casting
    Patent number: 4804297
    Abstract: A method of formless underwater casting of cement is disclosed. The method involves the addition of silicate to water in which a structure bound with Portland cement or high-alumina cement is to be cast. The cementitious mixture as a slurry is then poured into the water to form a structure. The silicate and cementitious mixture can be placed in the water at the same time using concentric nozzle systems.
    Type: Grant
    Filed: October 8, 1987
    Date of Patent: February 14, 1989
    Assignee: PQ Corporation
    Inventors: Richard H. Reifsnyder, Robert W. Spencer, Robert A. Brennan
  • Zinc rich paint vehicle
    Patent number: 4230496
    Abstract: Aqueous organic ammonium silicate-alkali metal silicate combination vehicles for zinc-rich, corrosion-resistant paints are improved by the addition of organosilicone-silicate polymers. The improvement is manifested by increased adhesion to poorly prepared metal surfaces and harder paint films.
    Type: Grant
    Filed: September 22, 1978
    Date of Patent: October 28, 1980
    Assignee: PQ Corporation
    Inventors: James S. Falcone, Jr., Robert W. Spencer
  • Mixing reactive liquids and preparing coagulant aids
    Patent number: 4147657
    Abstract: An apparatus and process for the preparation of colloidal dispersions of sodium metallo silicates, useful as coagulant aids, are disclosed. The dispersions are prepared by the controlled sequential mixing of separate streams of water, sodium silicate and a metal salt in a mixing block that has no moving parts. The apparatus and process are also useful in the mixing of other reactive solutions and fluids.
    Type: Grant
    Filed: August 3, 1977
    Date of Patent: April 3, 1979
    Assignee: PQ Corporation
    Inventors: Robert J. Kovanda, Serge Maliar, Jr., Robert W. Spencer