Granted Patent
Utility
US 4,255,282 · App. 06/038,334
Hydrotreating catalyst and process for its preparation
Inventor:
Howard D. Simpson
Patented Case
View Patent ↗
Granted: Mar 10, 1981
Filed: May 11, 1979
Inventor
Howard D. Simpson
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.