Granted Patent
Utility
US 4,397,652 · App. 06/340,176
Process for the production of negligibly dusty preparations of dyes and optical brighteners
Inventor:
Konrad Neumann
Patented Case
View Patent ↗
Granted: Aug 9, 1983
Filed: Jan 18, 1982
Inventor
Konrad Neumann
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.