Granted Patent
Utility
US 4,970,308 · App. 07/397,703
Di(bis-(indolyl)ethylenyl)tetrahalophtalides
Inventor:
Ponnampalam Mathiaparanam
Patented Case
View Patent ↗
Granted: Nov 13, 1990
Filed: Aug 23, 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.