Issued Patents 2002
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6404885 | Method and system for providing multiple classes of telephone access service | Frank A. Field, Daniel Paul Heyman, Yonatan Aharon Levy, Danielle Liu, Jeffrey Polhemus +1 more | 2002-06-11 |