Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4939614 | Magnetic disk medium with circumferentially textured surfaces and varied surface roughness and method of producing the same | Takaaki Shirakura, Shinya Matsuoka, Hiroshi Yashiki, Masaki Ohura | 1990-07-03 |