Granted Patent
Utility
US 5,319,109 · App. 08/025,654
Polycyclic dyes
Inventor:
Prakash Patel
Patented Case
View Patent ↗
Granted: Jun 7, 1994
Filed: Mar 3, 1993
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.