Granted Patent
Utility
US 5,887,647 · App. 08/639,524
Decreasing contamination of molten metal prior to solidification casting
Inventors:
Scott D. Melville, Richard E. Hauldren
Patented Case
View Patent ↗
Granted: Mar 30, 1999
Filed: May 1, 1996
Inventors
Scott D. Melville
Richard E. Hauldren
Assignee (at issue)
Weirton Steeel 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.