Assignee
Inventors
- Sumio Umezawa (40 patents)
- Tsutomu Tsuchiya (31 patents)
- Tomio Takeuchi (160 patents)
- Kazuo Umezawa (8 patents)
- Yoshiaki Takahashi (20 patents)
- Tetsuo Shitara (5 patents)
- Yoshihiko Kobayashi (2 patents)
- Yasushi Takagi (9 patents)
US Patent 4873225 · Granted Oct 10, 1989