Granted Patent
Utility
US 4,791,017 · App. 06/947,991
Hard, gold-colored under layer for a gold or gold-containing surface layer and an article therewith
Inventors:
Dieter Hofmann, Klaus-Jurgen Heimbach, Helmut Petersein, Wolf-Dieter Munz
Patented Case
View Patent ↗
Granted: Dec 13, 1988
Filed: Dec 31, 1986
Inventors
Dieter Hofmann
Klaus-Jurgen Heimbach
Helmut Petersein
Wolf-Dieter Munz
Assignee (at issue)
Leybold-Heraeus GmbH
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.