Granted Patent
Utility
US 4,264,653 · App. 06/078,365
Coating of steel
Inventor:
Frank P. Lochel
Patented Case
View Patent ↗
Granted: Apr 28, 1981
Filed: Sep 24, 1979
Inventor
Frank P. Lochel
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.