Masayasu Yamaguchi

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Saitama, JP

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Patents Grantslast 30 patents

Information Patent Grant
Optical recording disk and manufacturing method thereof
- Patent number 5,217,850
- Issue date Jun 8, 1993
- Pioneer Electronic Corporation
- Seiro Fujii
- G11 - INFORMATION STORAGE
Information Patent Grant
Method of making magneto-optical recording disk
- Patent number 5,087,340
- Issue date Feb 11, 1992
- Pioneer Electronic Corporation
- Nobuaki Onagi
- G11 - INFORMATION STORAGE
Information Patent Grant
Honeycomb core diaphragm
- Patent number 4,471,028
- Issue date Sep 11, 1984
- Pioneer Electronic Corporation
- Masami Kimura
- H04 - ELECTRIC COMMUNICATION TECHNIQUE