Granted Patent
Utility
US 4,634,224 · App. 06/544,827
Low-loss correction filter for manufacturing the phosphor screens of color picture tubes
Inventor:
Bruno Fischer
Patented Case
View Patent ↗
Granted: Jan 6, 1987
Filed: Oct 24, 1983
Inventor
Bruno Fischer
Assignee (at issue)
International Standard Electric 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.