Granted Patent
Utility
US 5,229,522 · App. 07/576,765
Bis-(indolyl)ethylenes: process for their preparation
Inventor:
Ponnampalam Mathiaparanam
Patented Case
View Patent ↗
Granted: Jul 20, 1993
Filed: Sep 4, 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.