Granted Patent
Utility
US 4,757,340 · App. 07/001,522
Focusing apparatus for camera
Inventor:
Masaaki Tsukamoto
Patented Case
View Patent ↗
Granted: Jul 12, 1988
Filed: Jan 8, 1987
Inventor
Masaaki Tsukamoto
Assignee (at issue)
Nippon Kogaku K.K.
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.