Granted Patent
Utility
US 4,981,088 · App. 07/523,684
Slag eliminator for furnace viewing system
Inventor:
Ronnie E. Burris
Patented Case
View Patent ↗
Granted: Jan 1, 1991
Filed: May 14, 1990
Inventor
Ronnie E. Burris
Assignee (at issue)
Diamond Electronics, Inc.
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.