Granted Patent
Utility
US 5,886,183 · App. 08/729,124
Naphthalenelactamimide fluorescence dyes
Inventors:
Heinz Langhals, Petra Christa Von Unold
Patented Case
View Patent ↗
Granted: Mar 23, 1999
Filed: Oct 11, 1996
Inventors
Heinz Langhals
Petra Christa Von Unold
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.