Granted Patent
Utility
US 4,101,417 · App. 05/729,183
Method of negating the effects of metals poisoning on zeolitic cracking catalysts
Inventors:
Bruce R. Mitchell, Harold E. Swift
Patented Case
View Patent ↗
Granted: Jul 18, 1978
Filed: Oct 4, 1976
Inventors
Bruce R. Mitchell
Harold E. Swift
Assignee (at issue)
Gulf Research & Development Company
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.