Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5226222 | Fabrication method for transformers with an amorphous core | Masatake Hirai, Masatake Kokado, Takeshi Uchikura, Nobuyuki Sumida, Syoichi Shii +7 more | 1993-07-13 |
| 5055815 | Stationary induction electric apparatus | Yasuo Yamamoto, Masatake Hirai, Toshiko Yamada | 1991-10-08 |
| 4972573 | Method of manufacturing wound transformer cores | Yasuo Yamamoto, Masatake Hirai, Nobuyuki Sumida, Masatake Kokado | 1990-11-27 |
| 4970776 | Method of manufacturing a stationary induction electric apparatus | Yasuo Yamamoto, Masatake Hirai | 1990-11-20 |
| 4646803 | Case for protecting a magnetic core | Yasuo Yamamoto, Kazuhiro Arii, Kazuhiro Tanaka | 1987-03-03 |
| 4639707 | Transformer with toroidal magnetic core | Kazuhiro Tanaka, Yasuo Yamamoto, Masatake Hirai | 1987-01-27 |
| 4631509 | Electrical induction apparatus with support inside casing | Kazuhiro Arii, Yasuo Yamamoto, Nobuyuki Sumida, Kazuhiro Tanaka | 1986-12-23 |