Granted Patent
Utility
US 4,423,936 · App. 06/402,149
Photographic exposure control system and method
Inventor:
Bruce K. Johnson
Patented Case
View Patent ↗
Granted: Jan 3, 1984
Filed: Jul 26, 1982
Inventor
Bruce K. Johnson
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.