Granted Patent
Utility
US 4,749,556 · App. 06/804,548
Process for producing boron nitride
Inventors:
Lien N. Parrish, Charles C. Chase
Patented Case
View Patent ↗
Granted: Jun 7, 1988
Filed: Dec 4, 1985
Inventors
Lien N. Parrish
Charles C. Chase
Assignee (at issue)
Union Carbide 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.