Granted Patent
Utility
US 6,475,981 · App. 09/720,997
Freezing materials
Inventor:
Manfred Jaeckel
Patented Case
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Granted: Nov 5, 2002
Filed: Mar 13, 2001
Inventor
Manfred Jaeckel
Assignee (at issue)
Cognis Deutschland GmbH & Co. KG
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.