Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4696043 | Microphone apparatus having a variable directivity pattern | Makoto Iwahara, Atsushi Sakamoto | 1987-09-22 |
| 4559642 | Phased-array sound pickup apparatus | Atsushi Sakamoto, Makoto Iwahara | 1985-12-17 |
| 4521908 | Phased-array sound pickup apparatus having no unwanted response pattern | Atsushi Sakamoto, Makoto Iwahara | 1985-06-04 |
| 4412097 | Variable-directivity microphone device | Yukinobu Ishigaki, Kaoru Totsuka, Makoto Yamamoto | 1983-10-25 |
| 4399327 | Variable directional microphone system | Makoto Yamamoto, Yukinobu Ishigaki, Kaoru Totsuka | 1983-08-16 |
| 4354059 | Variable-directivity microphone device | Yukinobu Ishigaki, Kaoru Totsuka, Makoto Yamamoto | 1982-10-12 |
| 4308425 | Variable-directivity microphone device | Chikahide Momose, Atushi Yumoto, Hiroshi Ogawa, Isami Nomoto | 1981-12-29 |