Granted Patent
Utility
US 6,148,902 · App. 08/943,866
Multiple die casting machines with single vacuum source
Inventors:
Michael D. Zielinski, Edward M. Nelson, Walter H. Yelczyn, David M. Regenauer
Patented Case
View Patent ↗
Granted: Nov 21, 2000
Filed: Oct 8, 1997
Inventors
Michael D. Zielinski
Edward M. Nelson
Walter H. Yelczyn
David M. Regenauer
Assignee (at issue)
Outboard Marine 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.