Granted Patent
Utility
US 5,198,126 · App. 07/667,985
Tubular refractory product
Inventor:
Stephen Lee
Patented Case
View Patent ↗
Granted: Mar 30, 1993
Filed: Mar 12, 1991
Inventor
Stephen Lee
Assignee (at issue)
Thor Ceramics Limited
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.