Granted Patent
Utility
US 4,871,377 · App. 07/151,942
Composite abrasive compact having high thermal stability and transverse rupture strength
Inventor:
Robert H. Frushour
Patented Case
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Granted: Oct 3, 1989
Filed: Feb 3, 1988
Inventor
Robert H. Frushour
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.