Granted Patent
Utility
US 4,507,124 · App. 06/505,647
1:2 Metal complexes of azomethine dyes having arylazo groups
Inventors:
Alois Puntener, Fabio Beffa
Patented Case
View Patent ↗
Granted: Mar 26, 1985
Filed: Jun 20, 1983
Inventors
Alois Puntener
Fabio Beffa
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.