Akihiko Oka

Person

Kanagawa, JP

People

Patents Grantslast 30 patents

Information Patent Grant
Optical transmission apparatus monitoring optical performance
- Patent number 7,020,395
- Issue date Mar 28, 2006
- Fujitsu Limited
- Dai Hagimura
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Signal loopback device
- Patent number 6,657,953
- Issue date Dec 2, 2003
- Fujitsu Limited
- Masanori Hiramoto
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Transmission apparatus with control circuit/relay within each card...
- Patent number 6,192,437
- Issue date Feb 20, 2001
- Fujitsu Limited
- Akihiko Oka
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Apparatus and method for interfacing between communication networks
- Patent number 6,188,701
- Issue date Feb 13, 2001
- Fujitsu Limited
- Keiichiro Tsukamoto
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Path protection switch ring system for line saving even though line...
- Patent number 5,790,520
- Issue date Aug 4, 1998
- Fujitsu Limited
- Koji Iwamoto
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Network traffic protection system
- Patent number 5,757,774
- Issue date May 26, 1998
- Fujitsu Limited
- Akihiko Oka
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Add-drop multiplexer with enhancement of accessibility to signals i...
- Patent number 5,754,545
- Issue date May 19, 1998
- Fujitsu Limited
- Masahiro Shinbashi
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Interface unit for communication device with parts positioned on a...
- Patent number 5,719,747
- Issue date Feb 17, 1998
- Fujitsu Limited
- Kazuaki Kashiwada
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Alarm processing apparatus
- Patent number 5,640,140
- Issue date Jun 17, 1997
- Fujitsu Limited
- Akihiko Oka
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Optical terminal system having self-monitoring function
- Patent number 5,557,437
- Issue date Sep 17, 1996
- Fujitsu Limited
- Toshiharu Sakai
- H04 - ELECTRIC COMMUNICATION TECHNIQUE

Patents Applicationslast 30 patents

Information Patent Application
Optical transmission apparatus
- Publication number 20030152384
- Publication date Aug 14, 2003
- FUJITSU LIMITED
- Dai Hagimura
- H04 - ELECTRIC COMMUNICATION TECHNIQUE

Akihiko Oka

Person

Patents Grantslast 30 patents

Optical transmission apparatus monitoring optical performance

Signal loopback device

Transmission apparatus with control circuit/relay within each card...

Apparatus and method for interfacing between communication networks

Path protection switch ring system for line saving even though line...

Network traffic protection system

Add-drop multiplexer with enhancement of accessibility to signals i...

Interface unit for communication device with parts positioned on a...

Alarm processing apparatus

Optical terminal system having self-monitoring function

Patents Applicationslast 30 patents

Optical transmission apparatus