Granted Patent
Utility
US 4,280,897 · App. 06/153,806
Removal of contaminating metals from FCC catalyst by NH.sub.4 citrate chelates
Inventors:
Syed M. Shah, Hosheng Tu
Patented Case
View Patent ↗
Granted: Jul 28, 1981
Filed: May 27, 1980
Inventors
Syed M. Shah
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.