Granted Patent
Utility
US 5,145,944 · App. 07/674,630
Polyether-polyester block copolymers and their use as dispersants
Inventor:
Bettina Steinmann
Patented Case
View Patent ↗
Granted: Sep 8, 1992
Filed: Mar 25, 1991
Inventor
Bettina Steinmann
Assignee (at issue)
Ciba-Geigy
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.