Granted Patent
Utility
US 4,658,494 · App. 06/867,553
Apparatus for drilling printed circuit boards
Inventors:
Tamio Ohtani, Yasuhiko Kanaya, Hiroshi Aoyama, Nobuyasu Nonaka
Patented Case
View Patent ↗
Granted: Apr 21, 1987
Filed: May 28, 1986
Inventors
Tamio Ohtani
Yasuhiko Kanaya
Hiroshi Aoyama
Nobuyasu Nonaka
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.