Granted Patent
Utility
US 4,457,592 · App. 06/326,850
Optical system utilizing a transversely movable plate for focusing
Inventor:
James Baker
Patented Case
View Patent ↗
Granted: Jul 3, 1984
Filed: Dec 3, 1981
Inventor
James Baker
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.