Yuichi Kasahara

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Yamagata, JP

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Patents Grantslast 30 patents

Information Patent Grant
Method of manufacturing a magnesium diaphragm
- Patent number 7,308,750
- Issue date Dec 18, 2007
- Pioneer Corporation
- Hiroyuki Tomiyama
- C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...

Patents Applicationslast 30 patents

Information Patent Application
Bobbin integrated type magnesium diaphragm, manufacturing method th...
- Publication number 20050257999
- Publication date Nov 24, 2005
- Pioneer Corporation
- Hiroyuki Tomiyama
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
Vibrating plate for speaker and method of fabricating the same
- Publication number 20050226459
- Publication date Oct 13, 2005
- PIONEER CORPORATION
- Hiroyuki Tomiyama
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Application
Magnesium diaphragm, method for manufacturing the same, and speaker...
- Publication number 20040231136
- Publication date Nov 25, 2004
- PIONEER CORPORATION, TOHOKU PIONEER CORPORATION
- Hiroyuki Tomiyama
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...