Osamu Horikawa

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Kanagawa, JP

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Patents Grantslast 30 patents

Information Patent Grant
Earphone device
- Patent number 12,212,913
- Issue date Jan 28, 2025
- D&M Holdings, Inc.
- Shinya Narisawa
- G10 - MUSICAL INSTRUMENTS ACOUSTICS
Information Patent Grant
Headphones and ear pad
- Patent number 9,473,844
- Issue date Oct 18, 2016
- D&M Holdings, Inc.
- Osamu Horikawa
- H04 - ELECTRIC COMMUNICATION TECHNIQUE

Patents Applicationslast 30 patents

Information Patent Application
EARPHONE DEVICE
- Publication number 20220086555
- Publication date Mar 17, 2022
- D & M HOLDINGS, INC.
- Shinya Narisawa
- G10 - MUSICAL INSTRUMENTS ACOUSTICS
Information Patent Application
HEADPHONES AND EAR PAD
- Publication number 20150281828
- Publication date Oct 1, 2015
- D & M HOLDINGS, INC.
- Osamu Horikawa
- H04 - ELECTRIC COMMUNICATION TECHNIQUE