Granted Patent
Utility
US 4,383,023 · App. 06/307,647
Dye mordanting development
Inventor:
Frank Leonard Schadt, III
Patented Case
View Patent ↗
Granted: May 10, 1983
Filed: Oct 1, 1981
Inventor
Frank Leonard Schadt, III
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.