Granted Patent
Utility
US 4,996,328 · App. 07/320,642
Bis-(indolyl)ethylenes
Inventor:
Ponnampalam Mathiaparanam
Patented Case
View Patent ↗
Granted: Feb 26, 1991
Filed: Mar 8, 1989
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.