Granted Patent
Utility
US 4,879,265 · App. 07/192,379
Hydroprocessing catalyst and phosphorous and citric acid containing impregnating solution
Inventors:
Howard D. Simpson, Pauline B. Borgens
Patented Case
View Patent ↗
Granted: Nov 7, 1989
Filed: May 10, 1988
Inventors
Howard D. Simpson
Pauline B. Borgens
Assignee (at issue)
Union Oil Company of California
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.