Granted Patent
Utility
US 4,670,365 · App. 06/791,585
Photomask and method of fabrication thereof
Inventor:
Koichi Yoshihara
Patented Case
View Patent ↗
Granted: Jun 2, 1987
Filed: Oct 25, 1985
Inventor
Koichi Yoshihara
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.