Ryujiro Muramatsu

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Yokohama, JP

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Patents Grantslast 30 patents

Information Patent Grant
Telephone communication terminal and communication method
- Patent number 5,842,139
- Issue date Nov 24, 1998
- Hitachi, Ltd.
- Ryujiro Muramatsu
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Telephone exchange network using telephone exchanges with speech re...
- Patent number 5,675,632
- Issue date Oct 7, 1997
- Hitachi, Ltd.
- Toshiyuki Odaka
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Speech coding system using variable threshold values for noise redu...
- Patent number 4,918,734
- Issue date Apr 17, 1990
- Hitachi, Ltd.
- Ryujiro Muramatsu
- G10 - MUSICAL INSTRUMENTS ACOUSTICS