Granted Patent
Utility
US 4,782,111 · App. 06/939,261
Colorant formulation
Inventors:
Peter Klein, Bernd Dewald, Wolfgang Teige
Patented Case
View Patent ↗
Granted: Nov 1, 1988
Filed: Dec 5, 1986
Inventors
Peter Klein
Bernd Dewald
Wolfgang Teige
Assignee (at issue)
Hoechst GmbH
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.