Granted Patent
Utility
US 4,467,248 · App. 06/252,456
Variable electronic flash light equipment
Inventors:
Koji Watanabe, Michio Yagi
Patented Case
View Patent ↗
Granted: Aug 21, 1984
Filed: Apr 9, 1981
Inventors
Koji Watanabe
Michio Yagi
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.