Granted Patent
Utility
US 5,498,712 · App. 08/060,049
Triphenodioxazine dyes
Inventor:
Gordon Thomson
Patented Case
View Patent ↗
Granted: Mar 12, 1996
Filed: May 13, 1993
Inventor
Gordon Thomson
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.