Granted Patent
Utility
US 4,457,821 · App. 06/458,390
Cathodic protection apparatus for well coated metal vessels having a gross bare area
Inventors:
Leon P. Sudrabin, Paul Kaiser
Patented Case
View Patent ↗
Granted: Jul 3, 1984
Filed: Jan 17, 1983
Inventors
Leon P. Sudrabin
Paul Kaiser
Assignee (at issue)
Pennwalt Corporation
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.