Granted Patent
Utility
US 4,534,870 · App. 06/392,602
Crosslinker composition for high temperature hydraulic fracturing fluids
Inventor:
Dennis A. Williams
Patented Case
View Patent ↗
Granted: Aug 13, 1985
Filed: Jun 28, 1982
Inventor
Dennis A. Williams
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.