Granted Patent
Utility
US 5,054,554 · App. 07/552,404
Rate control method for hydraulic fracturing
Inventor:
C. Mark Pearson
Patented Case
View Patent ↗
Granted: Oct 8, 1991
Filed: Jul 13, 1990
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.