Granted Patent
Utility
US 4,915,550 · App. 07/288,153
Pressure foot of printed circuit board drilling apparatus
Inventors:
Kunio Arai, Yasuhiko Kanaya
Patented Case
View Patent ↗
Granted: Apr 10, 1990
Filed: Dec 22, 1988
Inventors
Kunio Arai
Yasuhiko Kanaya
Assignee (at issue)
Hitachi Seiko 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.