Granted Patent
Utility
US 4,457,831 · App. 06/409,203
Two-stage catalytic hydroconversion of hydrocarbon feedstocks using resid recycle
Inventor:
Jeffrey Gendler
Patented Case
View Patent ↗
Granted: Jul 3, 1984
Filed: Aug 18, 1982
Inventor
Jeffrey Gendler
Assignee (at issue)
HRI
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.