Granted Patent
Utility
US 4,881,941 · App. 07/217,800
Suppress dyeing method
Inventor:
Michael W. Dixon
Patented Case
View Patent ↗
Granted: Nov 21, 1989
Filed: Jul 12, 1988
Inventor
Michael W. Dixon
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.