Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4853579 | Drive method for ultrasonic motor providing enhanced stability of rotation | Osamu Kawasaki, Ritsuo Inaba, Tetsuji Fukada | 1989-08-01 |
| 4829209 | Ultrasonic motor with stator projections and at least two concentric rings of electrodes | Osamu Kawasaki, Ritsuo Inaba, Akira Tokushima | 1989-05-09 |