Granted Patent
Utility
US 5,001,105 · App. 07/576,813
Bis-(indoly)ethylenes record systems utilizing such compounds
Inventor:
Ponnampalam Mathiaparanam
Patented Case
View Patent ↗
Granted: Mar 19, 1991
Filed: Aug 25, 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.