Granted Patent
Utility
US 5,094,574 · App. 07/585,972
Spot facing method and apparatus for printed circuit board
Inventors:
Masao Nishigai, Tamio Otani, Yasuhiko Kanaya
Patented Case
View Patent ↗
Granted: Mar 10, 1992
Filed: Sep 21, 1990
Inventors
Masao Nishigai
Tamio Otani
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.