Granted Patent
Utility
US 4,731,340 · App. 07/017,957
Dual lift-off self aligning process for making heterojunction bipolar transistors
Inventors:
Mau-Chung Frank Chang, Peter M. Asbeck
Patented Case
View Patent ↗
Granted: Mar 15, 1988
Filed: Feb 24, 1987
Inventors
Mau-Chung Frank Chang
Peter M. Asbeck
Assignee (at issue)
Rockwell International 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.