Granted Patent
Utility
US 6,231,639 · App. 08/813,256
Modular filter for molten metal
Inventors:
David J. Eichenmiller, Richard S. Henderson, Lennard Lutes, Harvey G. Martin
Patented Case
View Patent ↗
Granted: May 15, 2001
Filed: Mar 7, 1997
Inventors
David J. Eichenmiller
Richard S. Henderson
Lennard Lutes
Harvey G. Martin
Assignee (at issue)
Metaullics Systems Co., L.P.
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.