Granted Patent
Utility
US 5,820,661 · App. 08/831,938
Ink compositions containing disazo dyes
Inventors:
Peter Gregory, Mark Kenworthy, Andrew H. M. Renfrew
Patented Case
View Patent ↗
Granted: Oct 13, 1998
Filed: Apr 2, 1997
Inventors
Peter Gregory
Mark Kenworthy
Andrew H. M. Renfrew
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.