Granted Patent
Utility
US 6,303,664 · App. 09/430,544
Treatment for reducing residual carbon in the lost foam process
Inventors:
Fred Sonnenberg, Kyosti Matti Taristo, Tom Johansson
Patented Case
View Patent ↗
Granted: Oct 16, 2001
Filed: Oct 29, 1999
Inventors
Fred Sonnenberg
Kyosti Matti Taristo
Tom Johansson
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.