Granted Patent
Utility
US 5,294,231 · App. 07/988,628
Dyeing process
Inventor:
Francis Palacin
Patented Case
View Patent ↗
Granted: Mar 15, 1994
Filed: Dec 10, 1992
Inventor
Francis Palacin
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.