Granted Patent
Utility
US 6,492,305 · App. 09/767,852
Method of controlling loss of a subterranean treatment fluid
Inventors:
Thomas R. Sifferman, John M. Swazey, C. Bryan Skaggs, Nina Nguyen, Daniel B. Solarek
Patented Case
View Patent ↗
Granted: Dec 10, 2002
Filed: Jan 24, 2001
Inventors
Thomas R. Sifferman
John M. Swazey
C. Bryan Skaggs
Nina Nguyen
Daniel B. Solarek
Assignees (at issue)
CP Kelco U.S., Inc.
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.