Granted Patent
Utility
US 4,885,264 · App. 07/345,201
Pressure-sintered polycpystalline mixed materials with a base of hexagonal boron nitride, oxides and carbides
Inventors:
Peter Sindlhauser, Klaus Hunold, Alfred Lipp
Patented Case
View Patent ↗
Granted: Dec 5, 1989
Filed: Apr 28, 1989
Inventors
Peter Sindlhauser
Klaus Hunold
Alfred Lipp
Assignee (at issue)
Elektroschmelzwerk Kempten GmbH
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.