Granted Patent
Utility
US 5,077,321 · App. 07/709,689
Process for the preparation of polyurethane substances using specific stabilizer systems
Inventor:
Peter Michaelis
Patented Case
View Patent ↗
Granted: Dec 31, 1991
Filed: Jun 3, 1991
Inventor
Peter Michaelis
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.