Granted Patent
Utility
US 4,816,663 · App. 07/030,990
Camera system with vignetting calculation and memory means
Inventors:
Ken Utagawa, Kunihisa Hoshino
Patented Case
View Patent ↗
Granted: Mar 28, 1989
Filed: Mar 27, 1987
Inventors
Ken Utagawa
Kunihisa Hoshino
Assignee (at issue)
NIKON 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.