Granted Patent
Utility
US 6,109,590 · App. 09/024,964
Iron ore slide valve with internal support clamp
Inventor:
Andre Koerner
Patented Case
View Patent ↗
Granted: Aug 29, 2000
Filed: Feb 12, 1998
Inventor
Andre Koerner
Assignee (at issue)
Tapco International 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.