Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5310222 | Optical device | Charles E. Chatwin, Ralph Kay, David Ezra | 1994-05-10 |
| 4747620 | Security card and security card blank | Ralph Kay | 1988-05-31 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5310222 | Optical device | Charles E. Chatwin, Ralph Kay, David Ezra | 1994-05-10 |
| 4747620 | Security card and security card blank | Ralph Kay | 1988-05-31 |