Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4822957 | Electrographic touch sensor having reduced bow of equipotential field lines therein | John T. Quirk, Jr. | 1989-04-18 |
| 4797514 | Touch sensitive device with increased linearity | William A. Gibson | 1989-01-10 |