Granted Patent
Utility
US 5,017,503 · App. 07/319,198
Process for making a bipolar transistor including selective oxidation
Inventor:
Hiroshi Shiba
Patented Case
View Patent ↗
Granted: May 21, 1991
Filed: Mar 6, 1989
Inventor
Hiroshi Shiba
Assignee (at issue)
NEC 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.