Makoto Oohashi

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Koriyama-shi, JP

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Patents Grantslast 30 patents

Information Patent Grant
DTMF signal transmission method and communication apparatus
- Patent number 7,532,606
- Issue date May 12, 2009
- Hitachi Telecom Technologies, Ltd
- Shinya Suzuki
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
DTMF signal transmission method and communication apparatus
- Patent number 7,062,033
- Issue date Jun 13, 2006
- Hitachi Telecom Technologies, Ltd.
- Shinya Suzuki
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
DTMF signal transmission method and communication apparatus
- Patent number 7,050,570
- Issue date May 23, 2006
- Hitachi Telecom Technologies, Ltd.
- Shinya Suzuki
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
System for transmitting DTMF signal and communication equipment the...
- Patent number 6,700,973
- Issue date Mar 2, 2004
- Hitachi Telecom Technologies, Ltd.
- Shinya Suzuki
- H04 - ELECTRIC COMMUNICATION TECHNIQUE

Patents Applicationslast 30 patents

Information Patent Application
DTMF signal transmission method and communication apparatus
- Publication number 20040161098
- Publication date Aug 19, 2004
- HITACHI TELECOM TECHNOLOGIES, LTD.
- Shinya Suzuki
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
DTMF signal transmission method and communication apparatus
- Publication number 20040160965
- Publication date Aug 19, 2004
- HITACHI TELECOM TECHNOLOGIES, LTD.
- Shinya Suzuki
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
DTMF signal transmission method and communication apparatus
- Publication number 20040160966
- Publication date Aug 19, 2004
- HITACHI TELECOM TECHNOLOGIES, LTD.
- Shinya Suzuki
- H04 - ELECTRIC COMMUNICATION TECHNIQUE