Granted Patent
Utility
US 6,543,573 · App. 09/730,742
Speaker unit, speaker system, and speaker diaphragm manufacturing method
Inventors:
Yoshihisa Ishihara, Takeshi Aoki, Satoshi Iwasaki, Hirotoshi Kakuta
Patented Case
View Patent ↗
Granted: Apr 8, 2003
Filed: Dec 7, 2000
Inventors
Yoshihisa Ishihara
Takeshi Aoki
Satoshi Iwasaki
Hirotoshi Kakuta
Assignee (at issue)
JSP 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.