Granted Patent
Utility
US 5,256,787 · App. 07/971,446
Tri-piperdine compounds as stabilizers for organic materials
Inventors:
Valerio Borzatta, Roberto Scrima, Graziano Vignali
Patented Case
View Patent ↗
Granted: Oct 26, 1993
Filed: Nov 4, 1992
Inventors
Valerio Borzatta
Roberto Scrima
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.