Granted Patent
Utility
US 5,701,657 · App. 08/265,146
Method of manufacturing a repulsion magnetic circuit type loudspeaker
Inventor:
Yoshio Sakamoto
Patented Case
View Patent ↗
Granted: Dec 30, 1997
Filed: Jun 24, 1994
Inventor
Yoshio Sakamoto
Assignee (at issue)
KENWOOD LIMITED
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.