Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4798322 | Card reader/writer station for use with a personal memory card using differential data transfer | Thomas M. Grill, Ronald Silver | 1989-01-17 |
| 4795898 | Personal memory card having a contactless interface using differential data transfer | Thomas M. Grill, Ronald Silver | 1989-01-03 |