Granted Patent
Utility
US 6,209,616 · App. 09/100,622
Vacuum-assisted, gravity-fed casting apparatus and method
Inventor:
Richard F. Polich
Patented Case
View Patent ↗
Granted: Apr 3, 2001
Filed: Jun 19, 1998
Inventor
Richard F. Polich
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.