Granted Patent
Utility
US 5,954,943 · App. 08/932,588
Method of inhibiting coke deposition in pyrolysis furnaces
Inventors:
Youdong Tong, Michael K. Poindexter
Patented Case
View Patent ↗
Granted: Sep 21, 1999
Filed: Sep 17, 1997
Inventors
Youdong Tong
Michael K. Poindexter
Assignee (at issue)
Nalco/Exxon Energy Chemicals, L.P.
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.