Granted Patent
Utility
US 5,157,012 · App. 07/557,284
Di[bis-(indolyl)ethylenyl]tetrahalophthalide record materials
Inventors:
Ponnampalam Mathiaparanam, Dean G. Dalebroux, Kenneth D. Glanz
Patented Case
View Patent ↗
Granted: Oct 20, 1992
Filed: Jul 24, 1990
Inventors
Ponnampalam Mathiaparanam
Dean G. Dalebroux
Kenneth D. Glanz
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.