Patents by Inventor William C. Pumphrey

William C. Pumphrey 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).

  • Cement mixing system
    Patent number: 5389145
    Abstract: A method for mixing cement with water is provided. Dry cement is first slurried in oil. The slurry is easily metered and mixed with water to obtain a cement/water/oil slurry having the desired density. Cement/water/oil slurries thus produced can be used in all applications and have properties, when cured, comparable to cements not containing oil. The method allows precision metering of the cement and therefore precision control over the density of the final cement slurry.
    Type: Grant
    Filed: December 29, 1993
    Date of Patent: February 14, 1995
    Assignee: The Western Company of North America
    Inventors: D. V. Satyanarayana Gupta, Marek K. Pakulski, William C. Pumphrey