Assignee
Inventors
- Hamao Umezawa (151 patents)
- Tomio Takeuchi (160 patents)
- Takaaki Aoyagi (44 patents)
- Mitsugu Hachisu (15 patents)
- Masao Hirayama (10 patents)
- Shinjiro Murata (2 patents)
- Shunzo Fukatsu (29 patents)
US Patent 4719231 · Granted Jan 12, 1988