Issued Patents 1982
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4346468 | High density information disc | Joseph R. Preston, David A. Berry | 1982-08-24 |
| 4346469 | High density information disc | Joseph R. Preston, David A. Berry | 1982-08-24 |
| 4342660 | High density information disc lubricants | David A. Berry, Joseph R. Preston | 1982-08-03 |
| 4340629 | High density information disc | Joseph R. Preston, David A. Berry | 1982-07-20 |