Issued Patents 2004
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6824867 | Non-magnetic composite particles, process for producing the same and magnetic recording medium using the same | Keisuke Iwasaki, Hiroko Morii, Mineko Ohsugi | 2004-11-30 |
| 6803104 | Magnetic recording medium, non-magnetic acicular black iron-based composite particles and process for producing the particles | Keisuke Iwasaki, Yasuyuki Tanaka, Hiroko Morii | 2004-10-12 |
| 6800684 | Composite particles, and tread rubber composition, paint and resin composition using the same | Hiroko Morii, Keisuke Iwasaki, Mineko Ohsugi, Yusuke Shimohata | 2004-10-05 |
| 6767611 | Black magnetic acicular containing composite particles magnetic recording medium | Hiroko Morii, Mamoru Kamigaki, Yasuyuki Tanaka, Keisuke Iwasaki | 2004-07-27 |
| 6737211 | Color toner | Keisuke Iwasaki, Hiroko Morii | 2004-05-18 |
| 6723456 | Hematite particles aggregates, non-magnetic undercoatt layer for magnetic recording medium using the same, and magnetic recording medium having the non-magnetic undercoat layer | Keisuke Iwasaki, Seiji Ishitani, Hiroko Morii | 2004-04-20 |