Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4811951 | Puzzle including pieces formed from a crayon material | Denise Dorsey-Zinn, Michael F. Cassidy | 1989-03-14 |
| 4570936 | Jigsaw puzzle | Michael F. Cassidy | 1986-02-18 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4811951 | Puzzle including pieces formed from a crayon material | Denise Dorsey-Zinn, Michael F. Cassidy | 1989-03-14 |
| 4570936 | Jigsaw puzzle | Michael F. Cassidy | 1986-02-18 |