Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D260992 | Phone book telephone | William G. MacKenzie | 1981-09-29 |
| D259043 | Security telephone | John De Filippis, Ting-Wah Wong | 1981-04-28 |
| 4243845 | Repertory telephone dialing apparatus | John DeFilippis, Ting-Wah Wong | 1981-01-06 |