Granted Patent
Utility
US 4,366,271 · App. 06/266,790
Process for the production of colorant preparations and the colorant preparations obtained thereby
Inventor:
Albert Riegler
Patented Case
View Patent ↗
Granted: Dec 28, 1982
Filed: May 26, 1981
Inventor
Albert Riegler
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.