Granted Patent
Utility
US 4,476,239 · App. 06/491,466
Production of fluid catalytic cracking catalysts
Inventors:
Robert L. Chiang, Julius Scherzer
Patented Case
View Patent ↗
Granted: Oct 9, 1984
Filed: May 4, 1983
Inventors
Robert L. Chiang
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.