Granted Patent
Utility
US 4,609,028 · App. 06/622,718
Evaporative pattern assembly for use in sand casting
Inventor:
Russell J. VanRens
Patented Case
View Patent ↗
Granted: Sep 2, 1986
Filed: Jun 20, 1984
Inventor
Russell J. VanRens
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.