Granted Patent
Utility
US 4,883,580 · App. 07/338,018
Methods for deactivating iron in hydrocarbon fluids
Inventors:
Paul V. Roling, Joseph H. Y. Niu
Patented Case
View Patent ↗
Granted: Nov 28, 1989
Filed: Apr 14, 1989
Inventors
Paul V. Roling
Joseph H. Y. Niu
Assignee (at issue)
Betz Laboratories, Inc.
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.