Issued Patents All Time
Showing 26–31 of 31 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5498457 | Magnetic recording medium having a lubricant layer comprising ionically interbonded fluoropolyethers with acidic and basic terminal groups | Heigo Ishihara | 1996-03-12 |
| 5093211 | Magnetic recording medium comprising a surface treatment layer provided on the magnetic layer of specified fluorocarboxylic acid amine salts | Heigo Ishihara | 1992-03-03 |
| 5008128 | Process for producing information recording medium | Heigo Ishihara | 1991-04-16 |
| 4966797 | Process for producing magnetic recording medium, magnetic paint, and magnetic disk | Heigo Ishihara, Akira Osaki | 1990-10-30 |
| 4794035 | Magnetic recording medium | Heigo Ishihara, Tomoyuki Ohno, Motoo Akagi | 1988-12-27 |
| 4722859 | Magnetic recording medium | Heigo Ishihara, Motoo Akagi | 1988-02-02 |