Granted Patent
Utility
US 4,261,909 · App. 06/033,407
Process for the reductive removal of halogen atoms from anthraquinones
Inventors:
Athanassios Tzikas, Jurgen Markert
Patented Case
View Patent ↗
Granted: Apr 14, 1981
Filed: Apr 26, 1979
Inventors
Athanassios Tzikas
Jurgen Markert
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.