Granted Patent
Utility
US 5,281,241 · App. 07/986,066
Polycyclic dyes
Inventor:
Prakash Patel
Patented Case
View Patent ↗
Granted: Jan 25, 1994
Filed: Dec 4, 1992
Inventor
Prakash Patel
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.