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Keiichiro Kumagai
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Tokyo, JP
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Patents Grants
last 30 patents
Information
Patent Grant
Card holding structure for portable electronic device
Patent number
7,238,038
Issue date
Jul 3, 2007
NEC Corporation
Keiichiro Kumagai
G06 - COMPUTING CALCULATING COUNTING
Information
Patent Grant
Light diffusion unit
Patent number
6,644,822
Issue date
Nov 11, 2003
NEC Corporation
Keiichiro Kumagai
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Display panel structure with a reinforced sealing member
Patent number
6,462,803
Issue date
Oct 8, 2002
NEC Corporation
Keiichiro Kumagai
G02 - OPTICS
Information
Patent Grant
Portable radio having retractable keys, wherein the keys retract wi...
Patent number
6,314,274
Issue date
Nov 6, 2001
NEC Corporation
Keiichiro Kumagai
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Patents Applications
last 30 patents
Information
Patent Application
Card holding structure for portable electronic device
Publication number
20050135052
Publication date
Jun 23, 2005
NEC Corporation
Keiichiro Kumagai
G06 - COMPUTING CALCULATING COUNTING
Information
Patent Application
Light diffusion unit
Publication number
20020034070
Publication date
Mar 21, 2002
NEC Corporation
Keiichiro Kumagai
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Application
Display panel structure with a reinforced sealing member
Publication number
20010035931
Publication date
Nov 1, 2001
Keiichiro Kumagai
G02 - OPTICS