Granted Patent
Utility
US 5,209,832 · App. 07/805,428
Process for the preparation of metal complex dyes
Inventors:
Wilhelm Schmidt, Gerhard Beck
Patented Case
View Patent ↗
Granted: May 11, 1993
Filed: Dec 11, 1991
Inventors
Wilhelm Schmidt
Gerhard Beck
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.