Patents Represented by Attorney T. R. Weaver

Find this attorney in the Justia Lawyer Directory

  • Hydrolytically stable polymers for use in oil field cementing methods and compositions
    Patent number: 4515635
    Abstract: Cementing compositions and methods of using such compositions in oil, gas and water well cementing operations to reduce fluid loss from the composition to the formation are disclosed. Such compositions incorporate certain copolymers of N, N dimethylacrylamide and 2-acrylamido, 2-methyl propane sulfonic acid having mole ratios of between 1:4 and 4:1 respectively and average molecular weights of between about 75,000 and about 300,000.
    Type: Grant
    Filed: March 23, 1984
    Date of Patent: May 7, 1985
    Assignee: Halliburton Company
    Inventors: S. Prabhakara Rao, John F. Burkhalter