Sumio Hagiwara

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Tokorozawa, JP

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Patents Grantslast 30 patents

Information Patent Grant
Speaker system and method of controlling directivity thereof
- Patent number 5,233,664
- Issue date Aug 3, 1993
- Pioneer Electronic Corporation
- Hirofumi Yanagawa
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Molding compositions and diaphragms, arm pipes and head shells mold...
- Patent number 4,404,315
- Issue date Sep 13, 1983
- Pioneer Electronic Corporation
- Tsunehiro Tsukagoshi
- G10 - MUSICAL INSTRUMENTS ACOUSTICS
Information Patent Grant
Tone-arm elements
- Patent number 4,366,205
- Issue date Dec 28, 1982
- Pioneer Electronic Corporation
- Tsunehiro Tsukagoshi
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
Vibratory elements for audio equipment
- Patent number 4,362,772
- Issue date Dec 7, 1982
- Pioneer Electronic Corporation
- Tsunehiro Tsukagoshi
- B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
Information Patent Grant
Vibratory elements for audio equipment
- Patent number 4,343,376
- Issue date Aug 10, 1982
- Pioneer Electronic Corporation
- Tsunehiro Tsukagoshi
- G10 - MUSICAL INSTRUMENTS ACOUSTICS