Granted Patent
Utility
US 5,593,568 · App. 08/427,915
Coker/visbreaker and ethylene furnace antifoulant
Inventor:
Harald LEMKE
Patented Case
View Patent ↗
Granted: Jan 14, 1997
Filed: Apr 26, 1995
Inventor
Harald LEMKE
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.