Granted Patent
Utility
US 4,968,638 · App. 07/239,646
Semiconductor devices
Inventors:
Stephen W. Wright, Charles P. Judge, Michael Lee
Patented Case
View Patent ↗
Granted: Nov 6, 1990
Filed: Sep 2, 1988
Inventors
Stephen W. Wright
Charles P. Judge
Michael Lee
Assignee (at issue)
NATIONAL RESEARCH DEVELOPMENT 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.