Granted Patent
Utility
US 4,879,592 · App. 07/189,374
Camera with two-bladed shutter mechanism with multiple filter apertures disposed for relative movement to provide sequential color separation exposures
Inventor:
Paul W. Ernest
Patented Case
View Patent ↗
Granted: Nov 7, 1989
Filed: May 2, 1988
Inventor
Paul W. Ernest
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.