Issued Patents All Time
Showing 26–28 of 28 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4281223 | Electro-acoustic transducer | Masana Ugaji, Sadaaki Sakurai, Shigenori Yamaoka, Toshinaga Endo, Akinobu Kusuhara | 1981-07-28 |
| 4276452 | Membrane type electro-acoustic transducer | Masana Ugaji | 1981-06-30 |
| 4273968 | Electroacoustic transducer with magnetic flux directed slantly across a diaphragm | — | 1981-06-16 |