Granted Patent
Utility
US 5,693,216 · App. 08/657,120
Method of and composition for breaking oil and water emulsions in crude oil processing operations
Inventors:
Paul R. Hart, Jen-Chi Chen, Fu Chen, Thai H. Duong
Patented Case
View Patent ↗
Granted: Dec 2, 1997
Filed: Jun 3, 1996
Inventors
Paul R. Hart
Jen-Chi Chen
Fu Chen
Thai H. Duong
Assignee (at issue)
Betzdearborn, 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.