Assignee
Inventors
- Yoichi Kasai, deceased (3 patents)
- Akio Kawamura (21 patents)
- Yoshimi Nakanishi (2 patents)
- Akira Kakita (2 patents)
- Toshihiko Tsuburaya (2 patents)
- Yasuo Kuraoka (15 patents)
- Nobuo Sakao (9 patents)
US Patent 4987921 · Granted Jan 29, 1991