Kazumasa AZUMA

Person

Tokyo, JP

People

Patents Grantslast 30 patents

Information Patent Grant
VoIP gateway apparatus
- Patent number 7,856,009
- Issue date Dec 21, 2010
- Hitachi, Ltd.
- Kazumasa Azuma
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
VoIP gateway apparatus, and method for controlling call-in/call-out...
- Patent number 7,764,666
- Issue date Jul 27, 2010
- Hitachi, Ltd.
- Noboru Yamada
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
ATM equipment
- Patent number 6,912,220
- Issue date Jun 28, 2005
- Hitachi Telecom Technologies
- Kazumasa Azuma
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Line switching system and line switching unit of dynamic band varia...
- Patent number 6,862,290
- Issue date Mar 1, 2005
- Hitachi Telecom Technologies, LTD.
- Ikuo Aso
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Multiple band change-over method for multiplex communication equipment
- Patent number 6,215,794
- Issue date Apr 10, 2001
- Hitachi Telecom Technologies, Ltd.
- Sakae Watanabe
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Maintenance and supervisory control method and system for multiplex...
- Patent number 6,031,824
- Issue date Feb 29, 2000
- Hitachi Telecom Technologies, Ltd.
- Kazumasa Azuma
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Multiplex communication equipment and communication test method the...
- Patent number 5,999,516
- Issue date Dec 7, 1999
- Hitachi Telecom Technologies, Ltd.
- Kaoru Suzuki
- G08 - SIGNALLING
Information Patent Grant
Circuit switching control method for multiplex communication equipment
- Patent number 5,953,313
- Issue date Sep 14, 1999
- Hitachi Telecom Technologies Ltd.
- Ikuo Aso
- H04 - ELECTRIC COMMUNICATION TECHNIQUE

Patents Applicationslast 30 patents

Information Patent Application
INFORMATION COLLECTION SYSTEM, RELAY TERMINAL, CONTROL METHOD FOR R...
- Publication number 20160294465
- Publication date Oct 6, 2016
- Hitachi, Ltd
- Satoshi HASHIMOTO
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
VoIP Gateway Apparatus, And Method For Controlling Call-In/Call-Out...
- Publication number 20070201493
- Publication date Aug 30, 2007
- Noboru Yamada
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
VoIP gateway apparatus
- Publication number 20060182089
- Publication date Aug 17, 2006
- Kazumasa Azuma
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
ATM equipment
- Publication number 20020024957
- Publication date Feb 28, 2002
- Kazumasa Azuma
- H04 - ELECTRIC COMMUNICATION TECHNIQUE

Kazumasa AZUMA

Person

Patents Grantslast 30 patents

VoIP gateway apparatus

VoIP gateway apparatus, and method for controlling call-in/call-out...

ATM equipment

Line switching system and line switching unit of dynamic band varia...

Multiple band change-over method for multiplex communication equipment

Maintenance and supervisory control method and system for multiplex...

Multiplex communication equipment and communication test method the...

Circuit switching control method for multiplex communication equipment

Patents Applicationslast 30 patents

INFORMATION COLLECTION SYSTEM, RELAY TERMINAL, CONTROL METHOD FOR R...

VoIP Gateway Apparatus, And Method For Controlling Call-In/Call-Out...

VoIP gateway apparatus

ATM equipment