Granted Patent
Utility
US 6,437,068 · App. 09/760,317
Water-soluble or water-swellable crosslinked copolymers
Inventors:
Matthias Loffler, Roman Morschhäuser
Patented Case
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Granted: Aug 20, 2002
Filed: Jan 11, 2001
Inventors
Matthias Loffler
Roman Morschhäuser
Assignee (at issue)
Clariant Corporation
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.