Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4629832 | Communication system administration method and circuitry | Mary S. Petrick, Lee A. Vallone, John D. Walker | 1986-12-16 |
| 4560837 | Call transfer method and circuitry | Francis M. Fenton, David F. Jones | 1985-12-24 |