Patents by Inventor Roy B. Duke, Jr.

Roy B. Duke, Jr. 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).

  • Injectivity of crude oil and petroleum sulfonate slugs by the addition of an alkylbenzene sulfonate
    Patent number: 4414119
    Abstract: Alkylbenzene sulfonate is added to a crude oil sulfonation product to prevent the formation of insoluble precipitates in the crude oil sulfonation product. The use of an alkylbenzene sulfonate as an additive to a microemulsion slug containing crude oil sulfonation product improves the injectivity of the microemulsion slug and prevents substantial plugging of the fluid injection system and the subterranean oil-bearing formation by insoluble precipitates in the microemulsion.
    Type: Grant
    Filed: January 4, 1982
    Date of Patent: November 8, 1983
    Assignee: Marathon Oil Company
    Inventor: Roy B. Duke, Jr.