Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9551190 | Excavation tool | Masaya Hisada, Kazuyoshi Nakamura | 2017-01-24 |
| 8550191 | Digging tool, digging bit, and device | Masaya Hisada, Kazuyoshi Nakamura | 2013-10-08 |
| 8430977 | Hollow drilling steel rod and method of manufacturing the same | Masaya Hisada, Satoshi Nagase, Noritaka Takahata | 2013-04-30 |
| 5139099 | Excavation tool | Takeshi Hayashi, Shigeru Sato, Katsuaki Tsujimoto, Daishiro Miyazaki, Toshiki Ishimatsu +1 more | 1992-08-18 |
| 5113954 | Excavation tool | Takeshi Hayashi, Shigeru Sato, Katsuaki Tsujimoto, Daishiro Miyazaki, Toshiki Ishimatsu | 1992-05-19 |