Granted Patent
Utility
US 4,568,449 · App. 06/700,041
Hydrotreating catalyst and process
Inventors:
Paul K. Angmorter, Howard D. Simpson, Ryden L. Richardson
Patented Case
View Patent ↗
Granted: Feb 4, 1986
Filed: Feb 11, 1985
Inventors
Paul K. Angmorter
Howard D. Simpson
Ryden L. Richardson
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.