Granted Patent
Utility
US 4,823,154 · App. 07/240,006
Film advancing assembly for self-developing film
Inventor:
John I. Sturgis
Patented Case
View Patent ↗
Granted: Apr 18, 1989
Filed: Sep 1, 1988
Inventor
John I. Sturgis
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.