Granted Patent
Utility
US 4,439,356 · App. 06/240,031
Unsymmetrical fluorescein derivatives
Inventors:
Pyare Khanna, Warren Colvin
Patented Case
View Patent ↗
Granted: Mar 27, 1984
Filed: Mar 3, 1981
Inventors
Pyare Khanna
Warren Colvin
Assignee (at issue)
Syva Company
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.