Granted Patent
Utility
US 4,830,632 · App. 07/042,770
Aqueous composition from a sulfonated phenol, an amine and a tanning salt, process for the production thereof and use thereof as a tanning agent
Inventor:
Alain Lauton
Patented Case
View Patent ↗
Granted: May 16, 1989
Filed: Apr 27, 1987
Inventor
Alain Lauton
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.