Granted Patent
Utility
US 4,360,340 · App. 06/156,403
Thermal developer for dry silver photographic paper
Inventors:
Hans Peters, Klaus Weiss
Patented Case
View Patent ↗
Granted: Nov 23, 1982
Filed: Jun 4, 1980
Inventors
Hans Peters
Klaus Weiss
Assignee (at issue)
Dr. Ing. Rudolf Hell GmbH
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.