Granted Patent
Utility
US 4,917,822 · App. 07/193,372
Graphite-containing conductive suspension for picture tubes
Inventors:
Norbert Thiel, Rolf Zondler
Patented Case
View Patent ↗
Granted: Apr 17, 1990
Filed: May 12, 1988
Inventors
Norbert Thiel
Rolf Zondler
Assignee (at issue)
Nokia Graetz
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.