Patents by Inventor Nathan R. Greening

Nathan R. Greening 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