Granted Patent
Utility
US 4,632,186 · App. 06/814,350
Well cementing method using an AM/AMPS fluid loss additive blend
Inventors:
Virgilio G. Boncan, Richard G. Gandy
Patented Case
View Patent ↗
Granted: Dec 30, 1986
Filed: Dec 27, 1985
Inventors
Virgilio G. Boncan
Richard G. Gandy
Assignee (at issue)
Hughes Tool Company LLC
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.