Granted Patent
Utility
US 4,466,522 · App. 06/283,342
Electromagnetic spring-wound clutch
Inventor:
Tsunenori Shibuya
Patented Case
View Patent ↗
Granted: Aug 21, 1984
Filed: Jul 14, 1981
Inventor
Tsunenori Shibuya
Assignee (at issue)
Diesel Kiki 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.