Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4913694 | Method for manufacturing a picture and/or text changing slide | Gerrit Alphenaar | 1990-04-03 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4913694 | Method for manufacturing a picture and/or text changing slide | Gerrit Alphenaar | 1990-04-03 |