Patents by Inventor Paul C. Scheiner

Paul C. Scheiner 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).

  • Low shrinkage cement composition
    Patent number: 5389143
    Abstract: The present invention relates to the use of .alpha., .beta.-amino alcohols as a cement admixture to inhibit drying shrinkage of resultant cement compositions.
    Type: Grant
    Filed: July 29, 1993
    Date of Patent: February 14, 1995
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Ismail Abdelrazig, Paul C. Scheiner
  • Hydration retarder
    Patent number: 5215585
    Abstract: A method of reclaiming unset cement compositions by mixing a polymethoxy polyphosphonate to the unset composition to cause long-term retardation of cement hydration and subsequently treating the composition with a set accelerator to reinitiate hydration.
    Type: Grant
    Filed: October 25, 1991
    Date of Patent: June 1, 1993
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Narender P. Luthra, Charles G. Carter, Paul C. Scheiner