Granted Patent
Utility
US 4,912,438 · App. 07/260,243
Electromagnetic relay
Inventor:
Kiyotaka Yokoo
Patented Case
View Patent ↗
Granted: Mar 27, 1990
Filed: Oct 20, 1988
Inventor
Kiyotaka Yokoo
Assignee (at issue)
NEC CORPORATION
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.