Shuhei Ohta

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Tokyo, JP

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Patents Grantslast 30 patents

Information Patent Grant
Loudspeaker structure
- Patent number 5,668,886
- Issue date Sep 16, 1997
- Kabushiki Kaisha Kenwood
- Yoshio Sakamoto
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Speaker diaphragm
- Patent number 5,031,720
- Issue date Jul 16, 1991
- Kabushiki Kaisha Kenwood
- Shuhei Ohta
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Method for forming a hard carbon thin film on article and applicati...
- Patent number 4,772,513
- Issue date Sep 20, 1988
- Trio Kabushiki Kaisha
- Masakatsu Sakamoto
- C23 - COATING METALLIC MATERIAL COATING MATERIAL WITH METALLIC MATERIAL CHEMI...
Information Patent Grant
Method for forming a hard carbon thin film on article and applicati...
- Patent number 4,725,345
- Issue date Feb 16, 1988
- Kabushiki Kaisha Kenwood
- Masakatsu Sakamoto
- C23 - COATING METALLIC MATERIAL COATING MATERIAL WITH METALLIC MATERIAL CHEMI...