Granted Patent
Utility
US 4,612,352 · App. 06/673,212
Water-soluble or water-dispersible graft polymers, their preparation and their use
Inventors:
Paul Schafer, Heinz Abel, Christian Guth, Albert Stehlin
Patented Case
View Patent ↗
Granted: Sep 16, 1986
Filed: Nov 19, 1984
Inventors
Paul Schafer
Heinz Abel
Christian Guth
Albert Stehlin
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.