Granted Patent
Utility
US 4,593,739 · App. 06/567,330
Method of and apparatus for packing sand around a mold pattern by vibration
Inventors:
Russell J. VanRens, Frank V. Bailey
Patented Case
View Patent ↗
Granted: Jun 10, 1986
Filed: Dec 30, 1983
Inventors
Russell J. VanRens
Frank V. Bailey
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.