Granted Patent
Utility
US 5,969,115 · App. 09/165,041
Bisazo dyes and their preparation and use
Inventor:
Heinz Peter
Patented Case
View Patent ↗
Granted: Oct 19, 1999
Filed: Oct 1, 1998
Inventor
Heinz Peter
Assignee (at issue)
Ilford Imaging Switzerland GmbH
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.