Granted Patent
Utility
US 5,219,768 · App. 07/640,423
Method for fabricating a semiconductor device
Inventor:
Yoshihisa Okita
Patented Case
View Patent ↗
Granted: Jun 15, 1993
Filed: Jan 9, 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.