Granted Patent
Utility
US 4,374,866 · App. 06/283,327
Method of manufacturing correction filter for exposing screens of color-picture tubes
Inventors:
Nadezda Blahna, Bruno Fischer
Patented Case
View Patent ↗
Granted: Feb 22, 1983
Filed: Jul 15, 1981
Inventors
Nadezda Blahna
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.