Granted Patent
Utility
US 4,497,418 · App. 06/580,319
Repair plug assembly for vessel having a corrosion resistant lining
Inventor:
Erwin J. Nunlist
Patented Case
View Patent ↗
Granted: Feb 5, 1985
Filed: Feb 15, 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.