Granted Patent
Utility
US 4,548,610 · App. 06/590,930
Process for the preparation of solid photoactivator formulations: sulphonated zinc or aluminum phthalocyanine solutions
Inventors:
Werner Preiswerk, Beat Bruttel
Patented Case
View Patent ↗
Granted: Oct 22, 1985
Filed: Mar 19, 1984
Inventors
Werner Preiswerk
Beat Bruttel
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.