Granted Patent
Utility
US 5,110,874 · App. 07/510,929
Methods and compositions for reduction of drag in hydrocarbon fluids
Inventors:
Michael I. Naiman, James Chang
Patented Case
View Patent ↗
Granted: May 5, 1992
Filed: Apr 19, 1990
Inventors
Michael I. Naiman
James Chang
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.