Granted Patent
Utility
US 4,838,651 · App. 07/126,658
Projection tube having an insulating layer of magnesium oxide and a high transmission metal grating
Inventors:
Jurgen Pottharst, Kurt M. Tischer
Patented Case
View Patent ↗
Granted: Jun 13, 1989
Filed: Dec 1, 1987
Inventors
Jurgen Pottharst
Kurt M. Tischer
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.