Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9426290 | Multilevel directory assistance apparatus and method | Robert F. Perler | 2016-08-23 |
| 8712024 | Multilevel directory assistance apparatus and method | Robert F. Perler | 2014-04-29 |