Granted Patent
Utility
US 4,526,963 · App. 06/437,369
Dioxazine pigments
Inventor:
Michel Deur
Patented Case
View Patent ↗
Granted: Jul 2, 1985
Filed: Oct 28, 1982
Inventor
Michel Deur
Assignee (at issue)
Sandoz AG
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.