Granted Patent
Utility
US 4,362,873 · App. 06/246,979
Process for the preparation of basic oxazine dyestuffs
Inventor:
Gerard L. A. Belfort
Patented Case
View Patent ↗
Granted: Dec 7, 1982
Filed: Mar 24, 1981
Inventor
Gerard L. A. Belfort
Assignee (at issue)
P C U K Produits Chimiques Ugine Kuhlmann
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.