Issued Patents All Time
Showing 26–50 of 75 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6638618 | Black composite iron oxide pigment, and paint and resin composition using the same | Kazuyuki Hayashi, Yusuke Shimohata, Mineko Ohsugi | 2003-10-28 |
| 6623557 | Colorant for ink-jet printing ink, ink-jet printing ink, aqueous pigment dispersion containing the colorant, and organic and inorganic composite particles | Kazuyuki Hayashi, Keisuke Iwasaki | 2003-09-23 |
| 6596071 | Organic and inorganic composite pigments, and paint and resin composition using the same | Kazuyuki Hayashi, Keisuke Iwasaki, Mineko Ohsugi, Yusuke Shimohata | 2003-07-22 |
| 6569530 | Magnetic recording medium and magnetic composite particles or magnetic recording medium | Kazuyuki Hayashi, Keisuke Iwasaki, Mamoru Kamigaki | 2003-05-27 |
| 6562532 | Black magnetic toner and black magnetic composite particles therefor | Kazuyuki Hayashi, Yasuyuki Tanaka, Seiji Ishitani | 2003-05-13 |
| 6544647 | Non-magnetic composite particles, process for producing the same and magnetic recording medium using the same | Kazuyuki Hayashi, Keisuke Iwasaki, Mineko Ohsugi | 2003-04-08 |
| 6531211 | Black plate-shaped ferrite composite particles with magnet oplumbite structure and magnetic recording medium using the same | Kazuyuki Hayashi, Mamoru Kamigaki, Yasuyuki Tanaka, Keisuke Iwasaki | 2003-03-11 |
| 6511733 | Magnetic recording medium containing specific non-magnetic composite particles of coated hematite particles | Kazuyuki Hayashi, Mamoru Kamigaki | 2003-01-28 |
| 6475687 | Magnetic composite particles for black magnetic toner and black magnetic toner using the same | Kazuyuki Hayashi, Yusuke Shimohata, Keisuke Iwasaki | 2002-11-05 |
| 6458452 | Titanium oxide particles, substrate for magnetic recording medium and magnetic recording medium using the same | Kazuyuki Hayashi, Keisuke Iwasaki, Yasuyuki Tanaka | 2002-10-01 |
| 6458453 | Magnetic recording medium | Kazuyuki Hayashi, Mamoru Kamigaki, Seiji Ishitani | 2002-10-01 |
| 6440561 | Iron oxide hydroxide composite particles, pigment, paint and resin composition | Kazuyuki Hayashi, Mineko Ohsugi | 2002-08-27 |
| 6432508 | High-density acicular hematite particles, non-magnetic undercoat layer and magnetic recording medium | Kazuyuki Hayashi, Keisuke Iwasaki, Yasuyuki Tanaka | 2002-08-13 |
| 6432377 | Particles for non-magnetic undercoat layer of magnetic recording medium, method thereof and magnetic recording medium | Kazuyuki Hayashi, Keisuke Iwasaki | 2002-08-13 |
| 6420030 | Black iron-based composite particles, process for producing the same, paint and rubber or resin composition containing the same | Kazuyuki Hayashi, Yasuyuki Tanaka | 2002-07-16 |
| 6416864 | Black magnetic composite particles for a black magnetic toner | Kazuyuki Hayashi, Yasuyuki Tanaka, Seiji Ishitani | 2002-07-09 |
| 6379855 | Black magnetic toner and black magnetic composite particles therefor | Kazuyuki Hayashi, 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 | Kazuyuki Hayashi, Keisuke Iwasaki, Yasuyuki Tanaka | 2002-03-05 |
| 6350505 | High-density acicular hematite particles, non-magnetic undercoat layer and magnetic recording medium | Kazuyuki Hayashi, Keisuke Iwasaki, Yasuyuki Tanaka | 2002-02-26 |
| 6299973 | Acicular hematite particles having a low sodium content and their use in a magnetic recording medium | Kazuyuki Hayashi, Keisuke Iwasaki | 2001-10-09 |
| 6294242 | Magnetic recording medium | Kazuyuki Hayashi, Mamoru Kamigaki, Yasuyuki Tanaka, Keisuke Iwasaki | 2001-09-25 |
| 6287668 | Magnetic recording medium and substrate therefor | Kazuyuki Hayashi, Keisuke Iwasaki, Yasuyuki Tanaka | 2001-09-11 |
| 6251555 | Black magnetic composite particles for black magnetic toner and black magnetic toner using the same | Kazuyuki Hayashi, Seiji Ishitani, Yasuyuki Tanaka | 2001-06-26 |
| 6248437 | Magnetic recording medium containing non-magnetic hematite particles as an undercoat layer | Kazuyuki Hayashi, Keisuke Iwasaki, Yasuyuki Tanaka | 2001-06-19 |
| 6231661 | Fine red iron oxide pigment, and paint or resin composition using the same | Kazuyuki Hayashi, Mineko Ohsugi | 2001-05-15 |