Granted Patent
Utility
US 5,332,816 · App. 07/555,283
Piperazine-piperidine compounds for use as stabilizers for organic materials
Inventors:
Graziano Vignali, Valerio Borzatta
Patented Case
View Patent ↗
Granted: Jul 26, 1994
Filed: Jul 19, 1990
Inventors
Graziano Vignali
Valerio Borzatta
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.