Granted Patent
Utility
US 4,258,790 · App. 06/005,954
Well cementing method using low fluid-loss cement slurry
Inventor:
Billy W. Hale
Patented Case
View Patent ↗
Granted: Mar 31, 1981
Filed: Jan 24, 1979
Inventor
Billy W. Hale
Assignee (at issue)
Western Company of North America
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.