Granted Patent
Utility
US 5,019,274 · App. 07/374,900
Methods for treating hydrocarbon recovery operations and industrial waters
Inventors:
Neil E. S. Thompson, Robert G. Asperger
Patented Case
View Patent ↗
Granted: May 28, 1991
Filed: Jun 30, 1989
Inventors
Neil E. S. Thompson
Robert G. Asperger
Assignee (at issue)
Petrolite Corporation
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.