Granted Patent
Utility
US 5,216,136 · App. 07/674,440
Fiber-reactive disazo dyes containing piperazino linking radicals and processes of dyeing therewith
Inventor:
Markus Gisler
Patented Case
View Patent ↗
Granted: Jun 1, 1993
Filed: Mar 22, 1991
Inventor
Markus Gisler
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.