Patents by Inventor Walter M. Freitas

Walter M. Freitas 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).

  • High early strength cement and additives and methods for making the same
    Patent number: 6641661
    Abstract: A method for improving early strength of cements, comprising introducing into a cement during the grinding thereof (a) at least one water reducer comprising a polyoxyalkylene polymer; (b) a sugar; (c) an alkali or alkaline earth metal chloride; and (d) an amine. Additives and cement compositions are also disclosed.
    Type: Grant
    Filed: January 30, 2002
    Date of Patent: November 4, 2003
    Assignee: W. R. Grace & Co.-Conn.
    Inventors: Leslie A. Jardine, Josephine H. Cheung, Walter M. Freitas