Keiichi Katayanagi

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Kanagawa, JP

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Patents Grantslast 30 patents

Information Patent Grant
Speech signal transmitting and receiving apparatus with noise sensi...
- Patent number 5,732,390
- Issue date Mar 24, 1998
- Keiichi Katayanagi
- G10 - MUSICAL INSTRUMENTS ACOUSTICS
Information Patent Grant
Noise reducing method, noise reducing apparatus and telephone set
- Patent number 5,687,285
- Issue date Nov 11, 1997
- Sony Corporation
- Keiichi Katayanagi
- G10 - MUSICAL INSTRUMENTS ACOUSTICS