Granted Patent
Utility
US 4,892,941 · App. 07/181,859
Porphyrins
Inventors:
David Dolphin, Taku Nakano, Thomas K. Kirk, Tilak Wijesekera, Roberta L. Farrell, Theodore E. Maione
Patented Case
View Patent ↗
Granted: Jan 9, 1990
Filed: Apr 15, 1988
Inventors
David Dolphin
Taku Nakano
Thomas K. Kirk
Tilak Wijesekera
Roberta L. Farrell
Theodore E. Maione
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.