4-aminopyrimidinones and oxazolidino-4-aminopyrimidinones, process for their preparation and their use for stabilizing halogen-containing polymers

Granted: May 15, 2001 Filed: Apr 4, 2000

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.