Patents by Inventor Mitchael D. Coffey

Mitchael D. Coffey 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).

  • Aqueous wellbore service fluids
    Patent number: 4725372
    Abstract: A wellbore service fluid is provided which contains water, a water soluble electrolyte and as a thickening agent at least one of an amine, a salt of an amine, or quaternary ammonium salt which functions to increase the viscosity of the fluid in the presence of said electrolyte.
    Type: Grant
    Filed: January 6, 1983
    Date of Patent: February 16, 1988
    Assignee: The Dow Chemical Company
    Inventors: Arthur S. Teot, Muthyala Ramaiah, Mitchael D. Coffey