Granted Patent
Utility
US 4,238,364 · App. 06/026,636
Class of cracking catalysts acidic forms of cross-linked smectities
Inventor:
Joseph Shabtai
Patented Case
View Patent ↗
Granted: Dec 9, 1980
Filed: Apr 3, 1979
Inventor
Joseph Shabtai
Assignee (at issue)
THE UNIVERSITY OF UTAH
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.