Issued Patents All Time
Showing 1–12 of 12 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7172642 | Magnetic metal particles containing iron as main component, process for producing the same and magnetic recording medium using the same | Akinori Yamamoto, Yasutaka Ota, Haruki Kurokawa | 2007-02-06 |
| 6916530 | Perpendicular magnetic recording medium | Jun Koujima, Teruaki Santoki, Takanori Doi | 2005-07-12 |
| 6821618 | Magnetic recording medium and process for producing the same | Jun Koujima, Teruaki Santoki, Kenichi Nakata, Takanori Doi, Kousaku Tamari | 2004-11-23 |
| 6753084 | Spindle-shaped magnetic alloy particles for magnetic recording, and magnetic recording medium | Haruki Kurokawa, Kenji Okinaka, Akinori Yamamoto, Yasutaka Ota | 2004-06-22 |
| 6632771 | Silica gel carrying titanium oxide photocatalyst | Chisako Shirai, Satoshi Takeuchi, Zenichi Yamada | 2003-10-14 |
| 6398863 | Spindle-shaped hematite particles and process for making spindle-shaped hematite particles | Kenji Okinaka | 2002-06-04 |
| 6309479 | Spindle-shaped goethite particles, spindle-shaped hematite particles and magnetic spindle-shaped metal particles containing iron as main component | Kenji Okinaka | 2001-10-30 |
| 5882795 | Non-magnetic coated particles having a defined parameter .alpha. of not less than 0.5 | Kazuyuki Hayashi, Keisuke Iwasaki, Yasuyuki Tanaka, Minoru Ohsugi, Hiroko Morii +2 more | 1999-03-16 |
| 5830557 | Non-magnetic undercoating layer for magnetic recording medium, magnetic recording medium and non-magnetic particles | Kazuyuki Hayashi, Keisuke Iwasaki, Yasuyuki Tanaka, Minoru Ohsugi, Hiroko Morii +2 more | 1998-11-03 |
| 5604015 | Non-magnetic undercoat layer for magnetic recording medium, magnetic recording medium and non-magnetic particles | Kazuyuki Hayashi, Keisuke Iwasaki, Yasuyuki Tanaka, Minoru Ohsugi, Hiroko Morii +2 more | 1997-02-18 |
| 5118575 | Plate-like composite ferrite fine particles for magnetic recording and a process for producing the same | Norio Sugita | 1992-06-02 |
| 5079092 | Plate-like composite ferrite fine particles suitable for use in magnetic recording and process for producing the same | Norimichi Nagai, Norio Sugita | 1992-01-07 |