Granted Patent
Utility
US 5,779,781 · App. 08/831,934
Ink and toner compositions containing substituted phenyl AZO thiophene dye
Inventors:
Peter Gregory, Alan T. Leaver
Patented Case
View Patent ↗
Granted: Jul 14, 1998
Filed: Apr 2, 1997
Inventors
Peter Gregory
Alan T. Leaver
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.