Granted Patent
Utility
US 5,320,741 · App. 07/865,317
Combination process for the pretreatment and hydroconversion of heavy residual oils
Inventors:
Axel Johnson, Elmo C. Brown
Patented Case
View Patent ↗
Granted: Jun 14, 1994
Filed: Apr 9, 1992
Inventors
Axel Johnson
Elmo C. Brown
Assignee (at issue)
Stone & Webster Engineering Corp.
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.