Granted Patent
Utility
US 4,298,490 · App. 06/102,056
Process for the production of washing powders of stabilized or enhanced appearance which contain fluorescent whitening agents
Inventors:
Burkhart Lange, Suresh C. Agarwal, Werner Fringeli, Franz Gunter
Patented Case
View Patent ↗
Granted: Nov 3, 1981
Filed: Dec 10, 1979
Inventors
Burkhart Lange
Suresh C. Agarwal
Werner Fringeli
Franz Gunter
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.