Assignee
Inventors
- Shigekazu Ito (15 patents)
- Katsumi Masuda (10 patents)
- Shoji Kasano (1 patents)
- Toshihiro Nagata (15 patents)
- Yoshiyuki Kojima (15 patents)
- Nobumitsu Sawai (11 patents)
- Shinichiro Maeno (5 patents)
US Patent 4992438 · Granted Feb 12, 1991