Patents by Inventor Steven R. Speech

Steven R. Speech 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).

  • Poly (urethane-urea) foam sealants for underground application and fluid precursors
    Patent number: 3985688
    Abstract: A water-bearing structure, such as a sewer, water line or aqueduct, is sealed to prevent or minimize the leakage of water into or from said structure by placing at the locus of said leakage a fluid sealing composition comprising a water-miscible mixture of isocyanate-terminated polyoxyethylene urethane prepolymers in a compatible, water-miscible solvent, and curing said prepolymer by reaction thereof with water to form a seal at said locus.
    Type: Grant
    Filed: January 28, 1974
    Date of Patent: October 12, 1976
    Assignee: Minnesota Mining and Manufacturing Company
    Inventor: Steven R. Speech