Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9148010 | Residual current device (RCD) with earth current sensing | Walter Henry Berryman | 2015-09-29 |
| 8953288 | Sentinel unit for an IT electrical distribution system having a floating reference conductor | Geoffrey Rubython, Wayne Callen, Walter Henry Berryman | 2015-02-10 |
| 8953295 | Protection system for an IT electrical distribution system having a floating reference conductor | Geoffrey Rubython, Wayne Callen, Walter Henry Berryman | 2015-02-10 |