Granted Patent
Utility
US 4,884,962 · App. 07/206,307
Multiple sprew bar stack mold
Inventor:
James Sheffield
Patented Case
View Patent ↗
Granted: Dec 5, 1989
Filed: Jun 14, 1988
Inventor
James Sheffield
Assignee (at issue)
Izon Industries Inc.
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.