Issued Patents All Time
Showing 76–100 of 131 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6458453 | Magnetic recording medium | Hiroko Morii, Mamoru Kamigaki, Seiji Ishitani | 2002-10-01 |
| 6458452 | Titanium oxide particles, substrate for magnetic recording medium and magnetic recording medium using the same | Keisuke Iwasaki, Yasuyuki Tanaka, Hiroko Morii | 2002-10-01 |
| 6440561 | Iron oxide hydroxide composite particles, pigment, paint and resin composition | Mineko Ohsugi, Hiroko Morii | 2002-08-27 |
| 6432377 | Particles for non-magnetic undercoat layer of magnetic recording medium, method thereof and magnetic recording medium | Keisuke Iwasaki, Hiroko Morii | 2002-08-13 |
| 6432508 | High-density acicular hematite particles, non-magnetic undercoat layer and magnetic recording medium | Keisuke Iwasaki, Yasuyuki Tanaka, Hiroko Morii | 2002-08-13 |
| 6420030 | Black iron-based composite particles, process for producing the same, paint and rubber or resin composition containing the same | Yasuyuki Tanaka, Hiroko Morii | 2002-07-16 |
| 6416864 | Black magnetic composite particles for a black magnetic toner | Hiroko Morii, Yasuyuki Tanaka, Seiji Ishitani | 2002-07-09 |
| 6379855 | Black magnetic toner and black magnetic composite particles therefor | Hiroko Morii, Yasuyuki Tanaka, Seiji Ishitani | 2002-04-30 |
| 6352776 | Magnetic recording medium, non-magnetic acicular black iron-based composite particles and process for producing the particles | Keisuke Iwasaki, Yasuyuki Tanaka, Hiroko Morii | 2002-03-05 |
| 6350505 | High-density acicular hematite particles, non-magnetic undercoat layer and magnetic recording medium | Keisuke Iwasaki, Yasuyuki Tanaka, Hiroko Morii | 2002-02-26 |
| 6299973 | Acicular hematite particles having a low sodium content and their use in a magnetic recording medium | Keisuke Iwasaki, Hiroko Morii | 2001-10-09 |
| 6294242 | Magnetic recording medium | Hiroko Morii, Mamoru Kamigaki, Yasuyuki Tanaka, Keisuke Iwasaki | 2001-09-25 |
| 6287668 | Magnetic recording medium and substrate therefor | Keisuke Iwasaki, Yasuyuki Tanaka, Hiroko Morii | 2001-09-11 |
| 6251555 | Black magnetic composite particles for black magnetic toner and black magnetic toner using the same | Seiji Ishitani, Yasuyuki Tanaka, Hiroko Morii | 2001-06-26 |
| 6248437 | Magnetic recording medium containing non-magnetic hematite particles as an undercoat layer | Keisuke Iwasaki, Hiroko Morii, Yasuyuki Tanaka | 2001-06-19 |
| 6231661 | Fine red iron oxide pigment, and paint or resin composition using the same | Mineko Ohsugi, Hiroko Morii | 2001-05-15 |
| 6207253 | Acicular hematite particles and magnetic recording medium | Yasuyuki Tanaka, Keisuke Iwasaki, Hiroko Morii | 2001-03-27 |
| 6207279 | High-density acicular hematite particles, non-magnetic undercoat layer and magnetic recording medium | Keisuke Iwasaki, Yasuyuki Tanaka, Hiroko Morii | 2001-03-27 |
| 6159592 | Magnetic recording medium | Keisuke Iwasaki, Hiroko Morii | 2000-12-12 |
| 6153296 | Acicular hematite particles and magnetic recording medium | Keisuke Iwasaki, Tosiharu Harada, Hiroko Morii | 2000-11-28 |
| 6139618 | Fine yellow composite iron oxide hydroxide pigment, and paint or resin composition using the same | Mineko Ohsugi, Hiroshi Sumita, Hiroko Morii | 2000-10-31 |
| 6130017 | Black non-magnetic composite particles for black toner and black toner using the same | Seiji Ishitani, Yasuyuki Tanaka, Hiroko Morii | 2000-10-10 |
| 6124022 | Acicular hematite particles for non-magnetic undercoat layer of magnetic recording medium, and magnetic recording medium using the same | Yasuyuki Tanaka, Keisuke Iwasaki, Hiroko Morii | 2000-09-26 |
| 6120898 | Hematite particles and magnetic recording medium using hematite particles as non-magnetic particles for a non-magnetic undercoat layer | Keisuke Iwasaki, Hiroko Morii, Yasuyuki Tanaka | 2000-09-19 |
| 6117540 | Non-magnetic black particles, non-magnetic black pigment therefrom and non-magnetic black filler therefrom | Yasuyuki Tanaka, Hiroko Morii, Hiroshi Sumita | 2000-09-12 |