Granted Patent
Utility
US 5,123,789 · App. 07/316,952
Method of and apparatus for machining printed circuit board
Inventors:
Tamio Ohtani, Yasuhiko Kanaya, Tuyoshi Yamaguchi
Patented Case
View Patent ↗
Granted: Jun 23, 1992
Filed: Feb 28, 1989
Inventors
Tamio Ohtani
Yasuhiko Kanaya
Tuyoshi Yamaguchi
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.