Granted Patent
Utility
US 5,234,844 · App. 07/734,620
Process for forming bipolar transistor structure
Inventor:
Yoshihisa Okita
Patented Case
View Patent ↗
Granted: Aug 10, 1993
Filed: Jul 23, 1991
Inventor
Yoshihisa Okita
Assignee (at issue)
OKI ELECTRIC INDUSTRY CO., LTD.
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.