Granted Patent
Utility
US 5,063,997 · App. 07/461,119
Method of preventing precipitation of iron compounds during acid treatment of wells
Inventors:
Sylvia K. Pachla, Robert S. Taylor, John Delorey
Patented Case
View Patent ↗
Granted: Nov 12, 1991
Filed: Jan 4, 1990
Inventors
Sylvia K. Pachla
Robert S. Taylor
John Delorey
Assignee (at issue)
Nowsco Well Service Ltd.
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.