Granted Patent
Utility
US 4,295,955 · App. 06/129,003
Attenuation of metal contaminants on cracking catalyst with a boron compound
Inventor:
Hosheng Tu
Patented Case
View Patent ↗
Granted: Oct 20, 1981
Filed: Mar 10, 1980
Inventor
Hosheng Tu
Assignee (at issue)
UOP LLC
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.