Granted Patent
Utility
US 6,710,094 · App. 10/322,404
Processes for preparing patterns for use in metal castings
Inventor:
Fred Sonnenberg
Patented Case
View Patent ↗
Granted: Mar 23, 2004
Filed: Dec 17, 2002
Inventor
Fred Sonnenberg
Assignee (at issue)
StyroChem Delaware, 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.