Patents by Inventor Colin J. Davidson

Colin J. Davidson 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).

  • Drilling fluid to minimize solids disintegration
    Patent number: 4828724
    Abstract: The present invention relates to a drilling fluid comprising a stable oil in water emulsion consisting of: (a) 50-96 %v aqueous phase, (b) 3-40%v oil phase, and (c) 1-10 %v of at least one surfactant belonging to the class of: (a) ethoxylated amines, (b) ethoxylated diamines, and (c) quaternary ethoxylated ammonium salts.
    Type: Grant
    Filed: December 11, 1987
    Date of Patent: May 9, 1989
    Assignee: Shell Oil Company
    Inventor: Colin J. Davidson