Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12197121 | Phase shift mask blank, manufacturing method of phase shift mask, and phase shift mask | Naoki Matsuhashi, Takuro Kosaka | 2025-01-14 |
| 12181790 | Reflective mask blank and reflective mask | Hideo Kaneko, Tsuneo Terasawa | 2024-12-31 |
| 12050396 | Reflective mask blank, method of manufacturing thereof, and reflective mask | Takuro Kosaka, Takuro Yamamoto, Yukio Inazuki | 2024-07-30 |
| 11422456 | Phase shift mask blank, method for producing phase shift mask, and phase shift mask | Takuro Kosaka, Naoki Matsuhashi | 2022-08-23 |
| 6310837 | Magnetic recording medium | Tsutomu Chou, Masao Shigeta, Masahiro Karatsu, Mari Fujii, Chikara Ishizaka +3 more | 2001-10-30 |
| 6202926 | Magnetic recording medium and method of making the same | Masahiro Ito, Masao Shigeta, Tsutomu Chou | 2001-03-20 |
| 6029895 | Magnetic recording medium and method of making the same | Masahiro Ito, Masao Shigeta, Tsutomu Chou | 2000-02-29 |
| 5229219 | Magnetic recording medium comprising a magnetic layer containing a specified magnetic ferrite powder and having a curie temperature up to 180.degree. C. | Hideharu Moro, Shigeo Satoh, Osamu Kohmoto, Tetsuhito Yoneyama, Haruyuki Takahashi +1 more | 1993-07-20 |
| 4923533 | Magnetic shield-forming magnetically soft powder, composition thereof, and process of making | Masao Shigeta, Tsutomu Choh, Hiroyoshi Shimizu, Ippo Hirai, Atsushi Makimura +1 more | 1990-05-08 |