Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11028593 | Side outlet device for a box gutter rainhead | Russell John Kirkwood, Rowan Warwick Gregory, Richard John Kingston | 2021-06-08 |
| 10428528 | Overflow device | Russell John Kirkwood | 2019-10-01 |