Granted Patent
Utility
US 5,831,040 · App. 08/873,305
Disazo reactive dyes, their preparation and use
Inventor:
Hans Reichert
Patented Case
View Patent ↗
Granted: Nov 3, 1998
Filed: Jun 11, 1997
Inventor
Hans Reichert
Assignee (at issue)
Ciba Specialty Chemicals Corporation
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.