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Takasi Kumagai
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Tokyo, JP
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last 30 patents
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Patent Grant
System for evaluating skills of to-be-examined person
Patent number
8,057,237
Issue date
Nov 15, 2011
Shinko Engineering Research Corp.
Takasi Kumagai
G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
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Patent Grant
Experiment and education system employing a plurality of units
Patent number
7,963,771
Issue date
Jun 21, 2011
Shinko Engineering Reseach Corp.
Takasi Kumagai
G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
Patents Applications
last 30 patents
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Patent Application
Experiment and education system employing a plurality of units
Publication number
20090092956
Publication date
Apr 9, 2009
Takasi Kumagai
G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
Information
Patent Application
System for evaluating skills of to-be-examined person
Publication number
20060085224
Publication date
Apr 20, 2006
Takasi Kumagai
G06 - COMPUTING CALCULATING COUNTING