Granted Patent
Utility
US 4,604,187 · App. 06/740,537
Hydrocracking with rare earth-containing Y zeolite compositions
Inventor:
John W. Ward
Patented Case
View Patent ↗
Granted: Aug 5, 1986
Filed: Jun 3, 1985
Inventor
John W. Ward
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.