Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5187710 | Method and apparatus for the billing of value-added communications calls | Nga V. Chau, Reuben D. Hauptman, David D. Kaufman, Barbara Joanne Kittredge, Pamela J. Lauber | 1993-02-16 |