Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5495237 | Measuring tool for collecting down hole information and metering valve for producing mud-pulse used in the same | Hajime Yuasa, Hikaru Kamiirisa, Keijiro Yamamoto, Hideyuki Miyaji | 1996-02-27 |
| 5295548 | Bottom-hole information collecting equipment | Hajime Yuasa | 1994-03-22 |