Granted Patent
Utility
US 4,806,820 · App. 07/147,523
Mask-frame assembly and method of manufacturing the same
Inventors:
Dietrich Berner, Rolf Reidinger, Rainer Vollath
Patented Case
View Patent ↗
Granted: Feb 21, 1989
Filed: Jan 25, 1988
Inventors
Dietrich Berner
Rolf Reidinger
Rainer Vollath
Assignee (at issue)
ALCATEL
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.