Granted Patent
Utility
US 5,310,767 · App. 07/988,503
Tetramethylpiperidine compounds for use as stabilizers for organic materials
Inventors:
Valerio Borzatta, Graziano Vignali
Patented Case
View Patent ↗
Granted: May 10, 1994
Filed: Dec 10, 1992
Inventors
Valerio Borzatta
Graziano Vignali
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.