Granted Patent
Utility
US 6,365,721 · App. 09/956,173
Water-soluble monoazo dyes, their preparation and use
Inventor:
Aloys Engel
Patented Case
View Patent ↗
Granted: Apr 2, 2002
Filed: Sep 18, 2001
Inventor
Aloys Engel
Assignee (at issue)
Dy Star Textilfarben GmbH & Co.
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.