Granted Patent
Utility
US 6,235,813 · App. 09/370,537
Dispersants for preparing aqueous pigment pastes
Inventors:
Petra Brandt, Eberhard Esselborn, Hans-Leo Karminski, Arno Knebelkamp, Christian Psiorz, Stefan Silber, Ellen Wallhorn
Patented Case
View Patent ↗
Granted: May 22, 2001
Filed: Aug 9, 1999
Inventors
Petra Brandt
Eberhard Esselborn
Hans-Leo Karminski
Arno Knebelkamp
Christian Psiorz
Stefan Silber
Ellen Wallhorn
Assignee (at issue)
Th. Goldschmidt. AG
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.