Granted Patent
Utility
US 4,455,173 · App. 06/368,321
Preparation of pigmentary form of quinacridone pigments
Inventor:
Edward E. Jaffe
Patented Case
View Patent ↗
Granted: Jun 19, 1984
Filed: Apr 16, 1982
Inventor
Edward E. Jaffe
Assignee (at issue)
E.I. DU PONT DE NEMOURS AND COMPANY
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.