Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5681636 | Magnetic recording disc substrate having a surface texture of non overlapping circular sub-arrays | — | 1997-10-28 |
| 5619489 | Hand-held telecommunication tester | Paul Chang, Robert C. Pfeiffer | 1997-04-08 |