Granted Patent
Utility
US 4,983,555 · App. 07/185,189
Application of transparent polycrystalline body with high ultraviolet transmittance
Inventors:
Donald W. Roy, James L. Hastert
Patented Case
View Patent ↗
Granted: Jan 8, 1991
Filed: Apr 22, 1988
Inventors
Donald W. Roy
James L. Hastert
Assignee (at issue)
Coors Porcelain Company
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.