Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12425775 | Magnetic circuit for acoustic transducer, and speaker unit | Takahiro Terada, Yukio Wakui, Masao Noro | 2025-09-23 |
| 11979724 | Speaker diaphragm and headphone | Hiroshi Nakashima | 2024-05-07 |
| 11716570 | Speaker diaphragm and method of producing speaker diaphragm | Hiroshi Nakashima | 2023-08-01 |
| 11432072 | Speaker diaphragm and production method thereof | Hiroshi Nakashima | 2022-08-30 |
| 11330362 | Acoustic device | Akihiko Nozaki, Masao Noro | 2022-05-10 |
| 4556336 | Pen core for writing instrument | Kazuo Kawaguchi | 1985-12-03 |