Patents by Inventor Robert W. Previte

Robert W. Previte 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).

  • Gypsum-free cement compositions
    Patent number: 4405372
    Abstract: Disclosed herein are gypsum-free cement compositions comprising portland cement, limestone and an amine salt of formic or acetic acid. The compositions exhibit compressive strength comparable to ordinary portland cement compositions containing gypsum and the setting properties of the compositions can be regulated.
    Type: Grant
    Filed: March 8, 1982
    Date of Patent: September 20, 1983
    Assignee: W. R. Grace & Co.
    Inventors: Frank G. Serafin, Robert W. Previte, Nathan R. Greening, David L. Kantro, Fulvio J. Tang
  • Method of enhancing the compressive strength of hydraulic cement composition
    Patent number: 4209336
    Abstract: The compressive strength of a hydrated hydraulic cement composition such as Portland cement concrete is enhanced by the addition of a very small amount of certain select synthetic non-ionic surface active agents to the compositions.
    Type: Grant
    Filed: February 16, 1979
    Date of Patent: June 24, 1980
    Assignee: W. R. Grace & Co.
    Inventor: Robert W. Previte
  • Additive composition for hydraulic cement compositions
    Patent number: 4116706
    Abstract: An improved additive composition for accelerating the rate of hydration and increasing the compressive strength of hydraulic cement compositions such as Portland cement concrete contains a chloride, formate or nitrite salt set accelerator, an amine and a small amount of a certain select synthetic non-ionic surface active agent.
    Type: Grant
    Filed: July 1, 1977
    Date of Patent: September 26, 1978
    Assignee: W. R. Grace & Co.
    Inventor: Robert W. Previte