Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6834523 | Method for producing seamless tube with grooved inner surface | Chikara Saeki, Kiyonori Ozeki, Hideki IWAMOTO | 2004-12-28 |
| 6336501 | Tube having grooved inner surface and its production method | Mamoru Ishikawa, Kiyonori Ozeki, Chikara Saeki | 2002-01-08 |
| 5915467 | Heat transfer tube with grooves in inner surface of tube | Mamoru Ishikawa, Chikara Saeki, Kiyonori Ozeki | 1999-06-29 |