Granted Patent
Utility
US 5,116,978 · App. 07/615,731
Process for bis(indolyl)ethylene synthesis
Inventor:
Ponnampalam Mathiaparanam
Patented Case
View Patent ↗
Granted: May 26, 1992
Filed: Nov 19, 1990
Inventor
Ponnampalam Mathiaparanam
Assignee (at issue)
Appleton Papers Inc.
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.