Granted Patent
Utility
US 4,859,281 · App. 07/058,066
Etching of copper and copper bearing alloys
Inventor:
Kurt Goltz
Patented Case
View Patent ↗
Granted: Aug 22, 1989
Filed: Jun 4, 1987
Inventor
Kurt Goltz
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.