Granted Patent
Utility
US 6,032,509 · App. 09/251,523
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Inventor:
Seiju Nagakura
Patented Case
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Granted: Mar 7, 2000
Filed: Feb 17, 1999
Inventor
Seiju Nagakura
Assignee (at issue)
Toyokoki 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.