Granted Patent
Utility
US 4,717,680 · App. 07/000,377
Fabrication of vertical NPN and PNP bipolar transistors in monolithic substrate
Inventor:
Leo R. Piotrowski
Patented Case
View Patent ↗
Granted: Jan 5, 1988
Filed: Jan 5, 1987
Inventor
Leo R. Piotrowski
Assignee (at issue)
HARRIS 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.