Perfluoroalkyl-substituted amino acid oligomers or polymers and their use as foam stabilizers in aqueous fire-fighting-foam agents and as oil repellent paper and textile finishes

Granted: Aug 20, 2002 Filed: Jan 18, 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.