Patents by Inventor Daniel C. Cavin

Daniel C. Cavin 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).

  • Timing the deposition of an asphalt plugging material from an asphalt-cationic emulsion
    Patent number: 4002204
    Abstract: In plugging a relatively low temperature subterranean earth formation by injecting a cationic emulsion that contains an asphalt and a pH-increasing reactant that subsequently breaks the emulsion, the timing of the emulsion breaking is improved by using a pH-increasing reactant comprising a mixture of urea and urease.
    Type: Grant
    Filed: November 13, 1975
    Date of Patent: January 11, 1977
    Assignee: Shell Oil Company
    Inventor: Daniel C. Cavin