Granted Patent
Utility
US 4,557,821 · App. 06/527,414
Heavy oil hydroprocessing
Inventors:
Jaime Lopez, Joel D. McKinney, Eugene A. Pasek
Patented Case
View Patent ↗
Granted: Dec 10, 1985
Filed: Aug 29, 1983
Inventors
Jaime Lopez
Joel D. McKinney
Eugene A. Pasek
Assignee (at issue)
Gulf Research & Development 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.