Issued Patents All Time
Showing 1–11 of 11 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11353144 | Threaded joint | Takamasa Kawai, Masaki Yoshikawa, Tsuyoshi Yoneyama, Seigo Goto | 2022-06-07 |
| 11053749 | Threaded joint for oil well steel pipe | Takamasa Kawai, Masaki Yoshikawa, Jun Takano, Takuya Nagahama | 2021-07-06 |
| 10900595 | Threaded joint for oil well tubing | Takamasa Kawai, Masaki Yoshikawa, Haruhiko Seki, Masateru Ueta, Jun Takano +1 more | 2021-01-26 |
| 10711533 | Threaded pipe joint | Masaki Yoshikawa, Kazunari Takahashi, Jun Takano, Takamasa Kawai, Tsuyoshi Yoneyama | 2020-07-14 |
| 6331216 | Steel pipe having high ductility and high strength and process for production thereof | Takaaki Toyooka, Akira Yorifuji, Masanori Nishimori, Motoaki Itadani, Yuji Hashimoto +6 more | 2001-12-18 |
| 6290789 | Ultrafine-grain steel pipe and process for manufacturing the same | Takaaki Toyooka, Akira Yorifuji, Masanori Nishimori, Motoaki Itadani, Yuji Hashimoto +6 more | 2001-09-18 |
| 6202463 | Plug and mandrel bar for seamless steel pipe rolling operation for manufacturing seamless steel pipe | Akira Yorifuji, Takaaki Toyooka | 2001-03-20 |
| 5983689 | Lubricant for use in hot work | Akira Yorifuji, Takaaki Toyooka, Ken Shimamoto, Masaharu Kita | 1999-11-16 |
| 5950310 | Forged roll for rolling a seamless steel pipe and manufacturing method of same | Akira Yorifuji, Toshiaki Kasuya, Yuichiro Sato, Shoitsu Seo, Satoshi Matsuoka | 1999-09-14 |
| 5859124 | Lubricant for use in hot work | Akira Yorifuji, Takaaki Toyooka, Ken Shimamoto, Masaharu Kita | 1999-01-12 |
| 5813962 | Forged roll for rolling a seamless steel pipe | Akira Yorifuji, Toshiaki Kasuya, Yuichiro Sato, Shoitsu Seo, Satoshi Matsuoka | 1998-09-29 |