Granted Patent
Utility
US 4,576,894 · App. 06/653,593
Tanning development in low silver photoimaging using polymeric couplers
Inventor:
Dennis S. Donald
Patented Case
View Patent ↗
Granted: Mar 18, 1986
Filed: Sep 24, 1984
Inventor
Dennis S. Donald
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.