Derivatives of 2,2,6,6-tetramethyl-4-piperidinol for use as light stabilizers, heat stabilizers and oxidation stabilizers for organic materials

Granted: Mar 5, 1996 Filed: Jul 11, 1994

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.