Granted Patent
Utility
US 4,382,015 · App. 06/344,106
Passivation of metal contaminants on cracking catalyst
Inventors:
Carmen Castillo, John C. Hayes
Patented Case
View Patent ↗
Granted: May 3, 1983
Filed: Jan 29, 1982
Inventors
Carmen Castillo
John C. Hayes
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.