Granted Patent
Utility
US 4,971,021 · App. 07/223,802
Apparatus for cutting semiconductor crystal
Inventors:
Yutaka Kubotera, Kazunari Akiyama
Patented Case
View Patent ↗
Granted: Nov 20, 1990
Filed: Jul 25, 1988
Inventors
Yutaka Kubotera
Kazunari Akiyama
Assignee (at issue)
Mitsubishi Kinzoku Kabushiki Kaisha
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.