Granted Patent
Utility
US 5,645,905 · App. 08/541,624
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Inventors:
Toyokazu Takubo, Ken Tanaka
Patented Case
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Granted: Jul 8, 1997
Filed: Oct 10, 1995
Inventors
Toyokazu Takubo
Ken Tanaka
Assignee (at issue)
Idemitsu Petrochemical 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.