Assignee
Inventors
- Kiyotomo Seto (15 patents)
- Hiroo Matsumoto (27 patents)
- Yoshimasa Kamikawaji (9 patents)
- Kazuhiko Ohrai (14 patents)
- Kyoko Nakayama (1 patents)
- Ryozo Sakoda (26 patents)
- Yukinori Masuda (8 patents)
US Patent 4900752 · Granted Feb 13, 1990