Granted Patent
Utility
US 4,269,477 · App. 05/860,441
Symmetrical objective
Inventor:
Masamichi Kitagawa
Patented Case
View Patent ↗
Granted: May 26, 1981
Filed: Dec 14, 1977
Inventor
Masamichi Kitagawa
Assignee (at issue)
Konishiroku Photo Industry Co., Ltd.
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.