| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Canada | 5 | |
| #2 | United States | 5 | |
| #3 | United Kingdom | 4 |
| # | Industry | |
|---|---|---|
| #1 | Telecommunications |
| # | Technology | |
|---|---|---|
| #1 | Telephonic communication |
| # | Name | Total Patents |
|---|---|---|
| #1 | Smith Maurice I | 6 |
| #2 | Gillen John D | 5 |
| #3 | Edwards Gerald L | 4 |
| #4 | Ullakko Richard J | 3 |
| #5 | Depinto Victor M | 3 |
| #6 | De Pinto Victor M | 1 |
| #7 | Hill Stephen R | 1 |
| Publication | Filing date | Title |
|---|---|---|
| CA1136741A | Expandable link telephone intercom system | |
| GB2058518A | Intercom systems | |
| US4258232A | Line hold circuits | |
| US4188511A | Multi-link telephone intercom system | |
| US4158110A | Tone selective key telephone intercom system including digital tone detector | |
| US4086441A | Message-waiting and do-not-disturb communications system | |
| US4086444A | Dial pulse key telephone intercom system |