2-(2-hydroxy-3-perflu oroalkylthiomethyl-5-alkylphenyl)-2H-benzotriazoles, processes for preparing them and stabilized compositions thereof

Granted: May 17, 1994 Filed: Jul 12, 1993

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.