Granted Patent
Utility
US 4,282,503 · App. 06/070,801
Electromagnetic device
Inventors:
Masami Shimizu, Hiroshi Aizawa
Patented Case
View Patent ↗
Granted: Aug 4, 1981
Filed: Aug 29, 1979
Inventors
Masami Shimizu
Hiroshi Aizawa
Assignee (at issue)
CANON KABUSHIKI KAISHA
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.