Patents by Inventor M. Kenneth Cowan

M. Kenneth Cowan 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).

  • Restoring lost circulation
    Patent number: 5325922
    Abstract: Method for restoring drilling fluid circulation to a borehole having strata being invaded by the drilling fluid, by circulating a non-conventional cementitious slurry such as drilling fluid-blast furnace slag mixture into the strata, and allowing the mixture to solidify in situ.
    Type: Grant
    Filed: October 22, 1992
    Date of Patent: July 5, 1994
    Assignee: Shell Oil Company
    Inventors: M. Kenneth Cowan, Arthur H. Hale