Granted Patent
Utility
US 5,629,422 · App. 08/343,393
(Di)arylaminoalkyl 4-hydroxyphenylalkanecarboxylates
Inventor:
Hugo Camenzind
Patented Case
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Granted: May 13, 1997
Filed: Nov 22, 1994
Inventor
Hugo Camenzind
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.