Granted Patent
Utility
US 5,485,313 · App. 08/144,126
Zoom lens systems
Inventor:
Ellis I. Betensky
Patented Case
View Patent ↗
Granted: Jan 16, 1996
Filed: Oct 27, 1993
Inventor
Ellis I. Betensky
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.