Granted Patent
Utility
US 6,774,167 · App. 10/111,469
Method for reducing cold stress whitening
Inventors:
Sabine Oepen, Norbert Niessner, Michael Breulmann, Norbert Güntherberg, Wil Duijzings
Patented Case
View Patent ↗
Granted: Aug 10, 2004
Filed: Apr 25, 2002
Inventors
Sabine Oepen
Norbert Niessner
Michael Breulmann
Norbert Güntherberg
Wil Duijzings
Assignee (at issue)
BASF SE
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.