Patents by Inventor Ward L. Copening

Ward L. Copening 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).

  • Lightweight cement slurry and method of use
    Patent number: 4415366
    Abstract: A foamed, thixotropic hydraulic cement slurry and method of using same in cementing subterranean voids. This lightweight cement slurry is particularly useful for cementing in oil or gas wellbores penetrating a weak underground formation which will be broken by cement slurries of ordinary density.
    Type: Grant
    Filed: September 21, 1982
    Date of Patent: November 15, 1983
    Assignee: The Dow Chemical Company
    Inventor: Ward L. Copening