Granted Patent
Utility
US 4,290,899 · App. 06/000,885
Thermal stabilizer for non-clay wellbore fluids
Inventors:
Thomas R. Malone, Talmage D. Foster, Jr., deceased, Sue T. Foster, executrix
Patented Case
View Patent ↗
Granted: Sep 22, 1981
Filed: Jan 4, 1979
Inventors
Thomas R. Malone
Talmage D. Foster, Jr., deceased
Sue T. Foster, executrix
Assignee (at issue)
Union Carbide Corporation
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.