Granted Patent
Utility
US 5,779,780 · App. 08/825,920
Ink and toner compositions containing a mixture of bis-azo dyes
Inventors:
Peter Gregory, John A. Taylor
Patented Case
View Patent ↗
Granted: Jul 14, 1998
Filed: Apr 2, 1997
Inventors
Peter Gregory
John A. Taylor
Assignee (at issue)
Zeneca Limited
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.