Granted Patent
Utility
US 4,297,387 · App. 06/156,433
Cubic boron nitride preparation
Inventor:
Harry A. Beale
Patented Case
View Patent ↗
Granted: Oct 27, 1981
Filed: Jun 4, 1980
Inventor
Harry A. Beale
Assignee (at issue)
Battelle Development Corporation
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.