Granted Patent
Utility
US 5,354,450 · App. 08/044,183
Phosphorothioate coking inhibitors
Inventors:
Youdong Tong, Michael K. Poindexter
Patented Case
View Patent ↗
Granted: Oct 11, 1994
Filed: Apr 7, 1993
Inventors
Youdong Tong
Michael K. Poindexter
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.