Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4795349 | Coded font keyboard apparatus | Robert Sprague | 1989-01-03 |
| 4768959 | Method of teaching and transcribing of language through the use of a periodic code of language elements | Robert Sprague | 1988-09-06 |
| 4650423 | Method of teaching and transcribing of language through the use of a periodic code of language elements | Robert Sprague | 1987-03-17 |