Granted Patent
Utility
US 4,307,171 · App. 06/160,650
Negative-working diazo type photoreproduction having improved D-min and line acuity
Inventor:
Robert C. Desjarlais
Patented Case
View Patent ↗
Granted: Dec 22, 1981
Filed: Jun 18, 1980
Inventor
Robert C. Desjarlais
Assignee (at issue)
James River Graphics Limited
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.