Granted Patent
Utility
US 6,663,825 · App. 10/262,677
Method and apparatus for installing or replacing a furnace tap hole insert
Inventors:
Louis A. Grant, Jr., Albert J. Kristoff
Patented Case
View Patent ↗
Granted: Dec 16, 2003
Filed: Sep 30, 2002
Inventors
Louis A. Grant, Jr.
Albert J. Kristoff
Assignee (at issue)
Louis A. Grant, 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.