Granted Patent
Utility
US 4,775,641 · App. 06/911,423
Method of making silicon-on-sapphire semiconductor devices
Inventors:
Michael Duffy, Glenn W. Cullen
Patented Case
View Patent ↗
Granted: Oct 4, 1988
Filed: Sep 25, 1986
Inventors
Michael Duffy
Glenn W. Cullen
Assignee (at issue)
General Electric Company
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.