Granted Patent
Utility
US 5,156,975 · App. 07/530,914
Field dispersant test for determining the fouling tendency of a crude oil process
Inventor:
Mark A. Nelson
Patented Case
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Granted: Oct 20, 1992
Filed: Jul 3, 1990
Inventor
Mark A. Nelson
Assignee (at issue)
Nalco Chemical Company
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.