Granted Patent
Utility
US 5,228,484 · App. 07/718,132
Air lance reel for catalyst unloading of tubular reactors
Inventor:
Kelly Johnson
Patented Case
View Patent ↗
Granted: Jul 20, 1993
Filed: Jun 20, 1991
Inventor
Kelly Johnson
Assignee (at issue)
Catalyst Technology
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.