| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 7 | |
| #2 | Canada | 3 | |
| #3 | Germany | 3 | |
| #4 | United Kingdom | 3 | |
| #5 | Japan | 3 | |
| #6 | France | 2 | |
| #7 | Sweden | 2 | |
| #8 | Brazil | 1 | |
| #9 | Switzerland | 1 | |
| #10 | EPO (European Patent Office) | 1 | |
| #11 | Netherlands | 1 | |
| #12 | WIPO (World Intellectual Property Organization) | 1 |
| # | Industry | |
|---|---|---|
| #1 | Electrical machinery and energy | |
| #2 | Audio-visual technology | |
| #3 | Measurement |
| # | Name | Total Patents |
|---|---|---|
| #1 | Penrod John K | 9 |
| #2 | Hancock Harold E | 5 |
| #3 | Penrod John Kareth | 3 |
| #4 | Jiyon Kei Penrotsudo | 3 |
| #5 | Penrod J K | 2 |
| Publication | Filing date | Title |
|---|---|---|
| US4389691A | Solid state arc suppression device | |
| US4251845A | Arc suppressor circuit | |
| CA1086850A | Power contactor and control circuit | |
| US4152634A | Power contactor and control circuit | |
| US4060847A | Cooling arrangement for electrical power contactor | |
| US4025820A | Contactor device including arc supression means | |
| US3993984A | Electronic underfrequency relay | |
| US3982137A | Arc suppressor circuit |