Granted Patent
Utility
US 4,477,336 · App. 06/512,320
Acid dealuminated Y-zeolite and cracking process employing the same
Inventor:
Julius Scherzer
Patented Case
View Patent ↗
Granted: Oct 16, 1984
Filed: Jul 11, 1983
Inventor
Julius Scherzer
Assignee (at issue)
Harshaw/Filtrol Partnership
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.