Granted Patent
Utility
US 4,538,543 · App. 06/668,594
Apparatus for applying internal coatings in hot vessels
Inventor:
Erwin J. Nunlist
Patented Case
View Patent ↗
Granted: Sep 3, 1985
Filed: Nov 5, 1984
Inventor
Erwin J. Nunlist
Assignee (at issue)
Kennecott Holdings 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.