Granted Patent
Utility
US 5,677,250 · App. 08/638,152
Low-temperature lead-free glaze for alumina ceramics
Inventor:
Randy O. Knapp
Patented Case
View Patent ↗
Granted: Oct 14, 1997
Filed: Apr 26, 1996
Inventor
Randy O. Knapp
Assignee (at issue)
Cooper Industries Holdings
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.