Assignee
Inventors
- Keiichi Hirata (15 patents)
- Yoshinari Morimoto (23 patents)
- Tomohiro Ban (10 patents)
- Tokihito Furushima (3 patents)
- Tomoko Miura (9 patents)
- Yoshie Ikeda (3 patents)
- Yasushi Kawakami (41 patents)
US Patent 4924433 · Granted May 8, 1990