Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5910009 | Communication aid using multiple membrane switches | Ruth B. Leff | 1999-06-08 |
| D363741 | Cabinet for instructional electronic communication | Ruth B. Leff | 1995-10-31 |
| 5382791 | Dual mode switch for handicapped | Ruth B. Leff | 1995-01-17 |
| 4954083 | Communication aid | Ruth B. Leff | 1990-09-04 |
| 4915632 | Communication aid with sequential lighting | Ruth B. Leff | 1990-04-10 |
| 4761633 | Communication aid | Ruth B. Leff | 1988-08-02 |