Granted Patent
Utility
US 5,009,269 · App. 07/560,533
Well cement fluid loss additive and method
Inventors:
Larry K. Moran, Thomas Murray
Patented Case
View Patent ↗
Granted: Apr 23, 1991
Filed: Jul 31, 1990
Inventors
Larry K. Moran
Thomas Murray
Assignee (at issue)
Conoco Inc.
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.