Granted Patent
Utility
US 6,110,415 · App. 08/938,086
Device for opening furnace tap holes
Inventors:
Raymond L. Hickman, Gerald J. Madden, Marvin R. Hackett
Patented Case
View Patent ↗
Granted: Aug 29, 2000
Filed: Sep 26, 1997
Inventors
Raymond L. Hickman
Gerald J. Madden
Marvin R. Hackett
Assignee (at issue)
FMC CORPORATION
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.