Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4887920 | Punctuation check feature for an electronic typewriter | Richard Roberts | 1989-12-19 |
| 4888730 | Memory typewriter with count of overused words | Richard Roberts | 1989-12-19 |
| 4847766 | Dictionary typewriter with correction of commonly confused words | Richard Roberts | 1989-07-11 |