Granted Patent
Utility
US 5,405,891 · App. 08/159,410
Oligomeric HALS phosphites and HALS phosphonites as stabilisers
Inventor:
Rita Pitteloud
Patented Case
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Granted: Apr 11, 1995
Filed: Nov 30, 1993
Inventor
Rita Pitteloud
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.