Granted Patent
Utility
US 4,746,690 · App. 06/864,637
Water-soluble polymer compositions
Inventors:
Peter Busch, Klaus Thiele
Patented Case
View Patent ↗
Granted: May 24, 1988
Filed: May 16, 1986
Inventors
Peter Busch
Klaus Thiele
Assignee (at issue)
Henkel Kommanditgesellschaft auf Aktien
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.