Granted Patent
Utility
US 6,180,571 · App. 08/901,805
Fluid loss control additives and subterranean treatment fluids containing the same
Inventors:
Thomas R. Sifferman, John M. Swazey, C. Bryan Skaggs, Nina Nguyen, Daniel B. Solarek
Patented Case
View Patent ↗
Granted: Jan 30, 2001
Filed: Jul 28, 1997
Inventors
Thomas R. Sifferman
John M. Swazey
C. Bryan Skaggs
Nina Nguyen
Daniel B. Solarek
Assignees (at issue)
Monsanto Company
National Starch and Chemical Investment Holding Copporation
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.