Granted Patent
Utility
US 6,409,962 · App. 09/678,292
Powder injector for ladle
Inventor:
Paul Lawson
Patented Case
View Patent ↗
Granted: Jun 25, 2002
Filed: Oct 2, 2000
Inventor
Paul Lawson
Assignee (at issue)
Rossborough Manufacturing 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.