Shigenori Yamaoka

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Yokohama, JP

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Patents Grantslast 30 patents

Information Patent Grant
Etching agent for polyimide type resins and process for etching pol...
- Patent number 4,431,478
- Issue date Feb 14, 1984
- Sumitomo Bakelite Co. Ltd.
- Shigenori Yamaoka
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
Information Patent Grant
Electro-acoustic transducer
- Patent number 4,281,223
- Issue date Jul 28, 1981
- Sony Corporation
- Masana Ugaji
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...