Granted Patent
Utility
US 6,218,459 · App. 09/313,026
Pigment pastes comprising hydrophobically modified polyaspartic acid derivatives
Inventors:
Burghard Gruning, Stefan Silber, Jorg Simpelkamp, Christian Weitemeyer
Patented Case
View Patent ↗
Granted: Apr 17, 2001
Filed: May 17, 1999
Inventors
Burghard Gruning
Stefan Silber
Jorg Simpelkamp
Christian Weitemeyer
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.