Granted Patent
Utility
US 5,289,220 · App. 07/999,780
Detachable close-up lens assembly for an adjustable focus lens camera incorporating a photoranging system
Inventors:
Alan Fidler, Nicholas M. Werthessen
Patented Case
View Patent ↗
Granted: Feb 22, 1994
Filed: Dec 28, 1992
Inventors
Alan Fidler
Nicholas M. Werthessen
Assignee (at issue)
Polaroid Corporation
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.