Granted Patent
Utility
US 6,460,321 · App. 08/990,007
Racquet string
Inventors:
Tatsumi Koshimae, Katsuo Kanno
Patented Case
View Patent ↗
Granted: Oct 8, 2002
Filed: Dec 12, 1997
Inventors
Tatsumi Koshimae
Katsuo Kanno
Assignee (at issue)
GOSEN 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.