Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5451163 | Method of teaching reading including displaying one or more visible symbols in a transparent medium between student and teacher | — | 1995-09-19 |
| 4969485 | Butterfly valve apparatus and method | Larry K. Ball | 1990-11-13 |