Granted Patent
Utility
US 4,775,451 · App. 07/079,996
Preparation of water-soluble food-grade triphenylmethane colors
Inventors:
Wolfgang Habermann, Odo Mayer, Peter Hammes, Bernd Landmann
Patented Case
View Patent ↗
Granted: Oct 4, 1988
Filed: Jul 31, 1987
Inventors
Wolfgang Habermann
Odo Mayer
Peter Hammes
Bernd Landmann
Assignee (at issue)
BASF SE
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.