Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4887173 | Storage apparatus including head drive control | Kimiyo Takahashi | 1989-12-12 |
| 4882720 | Memory device including a rotating disk and means for detecting change in frictional resistance between the disk and a read/record head | — | 1989-11-21 |
| 4811125 | Information recording/regenerating circuit for a memory unit | — | 1989-03-07 |
| 4809248 | Memory device including a rotating disk and means for detecting change in frictional resistance between the disk and a read/record head | — | 1989-02-28 |