Granted Patent
Utility
US 4,901,563 · App. 07/350,985
System for monitoring fluids during well stimulation processes
Inventor:
C. Mark Pearson
Patented Case
View Patent ↗
Granted: Feb 20, 1990
Filed: May 11, 1989
Inventor
C. Mark Pearson
Assignee (at issue)
Atlantic Richfield Company
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.