Granted Patent
Utility
US 3,977,963 · App. 05/568,913
Method of negating the effects of metals poisoning on cracking catalysts
Inventors:
Thomas C. Readal, Joel D. McKinney, Robert A. Titmus
Patented Case
View Patent ↗
Granted: Aug 31, 1976
Filed: Apr 17, 1975
Inventors
Thomas C. Readal
Joel D. McKinney
Robert A. Titmus
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.