Granted Patent
Utility
US 4,214,924 · App. 05/955,252
Method of improving surface characteristic of heat-treated metal
Inventor:
Joseph A. Piucci
Patented Case
View Patent ↗
Granted: Jul 29, 1980
Filed: Oct 27, 1978
Inventor
Joseph A. Piucci
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.