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Kiyokazu Otsuka
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Tokyo, JP
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Patents Grants
last 30 patents
Information
Patent Grant
Internal line control system
Patent number
6,931,000
Issue date
Aug 16, 2005
NEC Corporation
Kiyokazu Otsuka
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Private branch mobile communication system and method
Patent number
6,571,108
Issue date
May 27, 2003
NEC Corporation
Kiyokazu Otsuka
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Private branch exchange
Patent number
6,370,393
Issue date
Apr 9, 2002
NEC Corporation
Kiyokazu Otsuka
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Handover arrangement for mobile station moving across the boundary...
Patent number
6,330,448
Issue date
Dec 11, 2001
NEC Corporation
Kiyokazu Otsuka
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Private communications network system and method of authentication...
Patent number
5,670,950
Issue date
Sep 23, 1997
NEC Corporation
Kiyokazu Otsuka
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Grant
Simple communication system capable of message broadcasting
Patent number
5,515,034
Issue date
May 7, 1996
NEC Corporation
Kiyokazu Otsuka
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Patents Applications
last 30 patents
Information
Patent Application
Optimization of routing operation in contact center server
Publication number
20050275506
Publication date
Dec 15, 2005
NEC Corporation
Kiyokazu Otsuka
G06 - COMPUTING CALCULATING COUNTING
Information
Patent Application
Voice CODEC designating system
Publication number
20030016807
Publication date
Jan 23, 2003
NEC Corporation
Kiyokazu Otsuka
H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information
Patent Application
Internal line control system
Publication number
20010015969
Publication date
Aug 23, 2001
NEC Corporation
Kiyokazu Otsuka
H04 - ELECTRIC COMMUNICATION TECHNIQUE