Issued Patents All Time
Showing 51–75 of 75 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6207253 | Acicular hematite particles and magnetic recording medium | Kazuyuki Hayashi, Yasuyuki Tanaka, Keisuke Iwasaki | 2001-03-27 |
| 6207279 | High-density acicular hematite particles, non-magnetic undercoat layer and magnetic recording medium | Kazuyuki Hayashi, Keisuke Iwasaki, Yasuyuki Tanaka | 2001-03-27 |
| 6159592 | Magnetic recording medium | Kazuyuki Hayashi, Keisuke Iwasaki | 2000-12-12 |
| 6153296 | Acicular hematite particles and magnetic recording medium | Kazuyuki Hayashi, Keisuke Iwasaki, Tosiharu Harada | 2000-11-28 |
| 6139618 | Fine yellow composite iron oxide hydroxide pigment, and paint or resin composition using the same | Kazuyuki Hayashi, Mineko Ohsugi, Hiroshi Sumita | 2000-10-31 |
| 6130017 | Black non-magnetic composite particles for black toner and black toner using the same | Kazuyuki Hayashi, Seiji Ishitani, Yasuyuki Tanaka | 2000-10-10 |
| 6124022 | Acicular hematite particles for non-magnetic undercoat layer of magnetic recording medium, and magnetic recording medium using the same | Kazuyuki Hayashi, Yasuyuki Tanaka, Keisuke Iwasaki | 2000-09-26 |
| 6120898 | Hematite particles and magnetic recording medium using hematite particles as non-magnetic particles for a non-magnetic undercoat layer | Kazuyuki Hayashi, Keisuke Iwasaki, Yasuyuki Tanaka | 2000-09-19 |
| 6117540 | Non-magnetic black particles, non-magnetic black pigment therefrom and non-magnetic black filler therefrom | Yasuyuki Tanaka, Kazuyuki Hayashi, Hiroshi Sumita | 2000-09-12 |
| 6087004 | Non-magnetic black particles, non-magnetic black pigment therefrom and non-magnetic black filler therefrom | Yasuyuki Tanaka, Kazuyuki Hayashi, Hiroshi Sumita | 2000-07-11 |
| 6063490 | Magnetic recording medium comprising non-magnetic acicular particles containing mainly iron and having titanium dispersed therein | Kazuyuki Hayashi, Keisuke Iwasaki, Toshiharu Harada | 2000-05-16 |
| 6054201 | Magnetic recording medium | Kazuyuki Hayashi, Keisuke Iwasaki, Yasuyuki Tanaka | 2000-04-25 |
| 6042937 | Titanium oxide particles, substrate for magnetic recording medium and magnetic recording medium using the same | Kazuyuki Hayashi, Keisuke Iwasaki, Yasuyuki Tanaka | 2000-03-28 |
| 6030688 | Rectangular parallelopipedic lepidocrocite particles and magnetic recording medium containing the particles | Kazuyuki Hayashi, Yoshiro Okuda, Keisuke Iwasaki | 2000-02-29 |
| 6027559 | Yellow iron oxide hydroxide particles and process for producing the same | Mineko Ohsugi, Kazuyuki Hayashi, Hiroshi Sumita | 2000-02-22 |
| 6019834 | Pigment, process for producing the same and paint using the same | Kazuyuki Hayashi, Mineko Ohsugi, Mamoru Kamigaki | 2000-02-01 |
| 5922464 | Iron oxide particles | Kazuyuki Hayashi, Minoru Ohsugi, Koso Aoki | 1999-07-13 |
| 5882795 | Non-magnetic coated particles having a defined parameter .alpha. of not less than 0.5 | Kazuyuki Hayashi, Keisuke Iwasaki, Yasuyuki Tanaka, Minoru Ohsugi, Mineko Sakoda +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, Mineko Sakoda +2 more | 1998-11-03 |
| 5750250 | Hematite particles and magnetic recording medium having a non-magnetic under-coat layer containing hematite (Fe.sub.2 O.sub.3) particles. | Kazuyuki Hayashi, Keisuke Iwasaki, Yasuyuki Tanaka | 1998-05-12 |
| 5693690 | Rubber or resin composition | Kazuyuki Hayashi, Minoru Ohsugi, Koso Aoki | 1997-12-02 |
| 5686012 | Modified particles | Kazuyuki Hayashi, Mineko Sakoda, Minoru Ohsugi, Mamoru Kamigaki | 1997-11-11 |
| 5604015 | Non-magnetic undercoat layer for magnetic recording medium, magnetic recording medium and non-magnetic particles | Kazuyuki Hayashi, Keisuke Iwasaki, Yasuyuki Tanaka, Minoru Ohsugi, Mineko Sakoda +2 more | 1997-02-18 |
| 5543069 | Magnetic particles for magnetic recording medium and process for producing the same | Kazuyuki Hayashi, Minoru Ohsugi, Norio Sugita | 1996-08-06 |
| 5484545 | Magnetic particles for magnetic recording medium and process for producing the same | Kazuyuki Hayashi, Minoru Ohsugi, Norio Sugita | 1996-01-16 |