Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4868861 | Trunk dialing converter | — | 1989-09-19 |
| 4839906 | Processor based linked compressor-expander telecommunications system | Frederick Williams, John Eldon | 1989-06-13 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4868861 | Trunk dialing converter | — | 1989-09-19 |
| 4839906 | Processor based linked compressor-expander telecommunications system | Frederick Williams, John Eldon | 1989-06-13 |