Granted Patent
Utility
US 5,153,140 · App. 07/515,025
Process for controlling and optimising industrial processes for the preparation of dyes, fluorescent whitening agents and their intermediates
Inventors:
Horst Langfeld, Roland Minges, Claudio Puebla, Wilhelm Schmidt
Patented Case
View Patent ↗
Granted: Oct 6, 1992
Filed: Apr 24, 1990
Inventors
Horst Langfeld
Roland Minges
Claudio Puebla
Wilhelm Schmidt
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.