Granted Patent
Utility
US 4,874,885 · App. 07/133,414
Process for the preparation of mercaptomethylphenols
Inventors:
Werner Stegmann, Hans-Rudolf Meier, Samuel Evans, Roger Martin, Reto Luisoli
Patented Case
View Patent ↗
Granted: Oct 17, 1989
Filed: Dec 15, 1987
Inventors
Werner Stegmann
Hans-Rudolf Meier
Samuel Evans
Roger Martin
Reto Luisoli
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.