Patents by Inventor Charles K. Nmai

Charles K. Nmai 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).

  • Admixtures for inhibiting corrosion of steel in concrete
    Patent number: 5262089
    Abstract: An admixture for inhibiting chloride-induced corrosion in steel reinforcing in place in concrete comprises an O/W emulsion wherein the oil phase comprises an unsaturated fatty acid ester and ethoxylated nonyl phenol and the ester of an aliphatic carboxylic acid with a mono-, di- or trihydric alcohol and the water phase comprises a saturated fatty acid, an amphoteric compound, a glycol and a soap. The admixture is added to the concrete prior to placement.
    Type: Grant
    Filed: December 12, 1991
    Date of Patent: November 16, 1993
    Assignee: Sandoz Ltd.
    Inventors: Gregory S. Bobrowski, Mark A. Bury, Stephen A. Farrington, Charles K. Nmai