Granted Patent
Utility
US 4,661,239 · App. 06/882,556
Middle distillate producing hydrocracking process
Inventor:
Karl Z. Steigleder
Patented Case
View Patent ↗
Granted: Apr 28, 1987
Filed: Jul 7, 1986
Inventor
Karl Z. Steigleder
Assignee (at issue)
UOP LLC
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.