Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11988288 | Poppet-style valve arrangements | David John Owen Parkes, Barry Cannell Irvine, Graham Harwood Stephenson | 2024-05-21 |
| 9835256 | Self-aligning valve seal | Barry Cannell Irvine, Graham Harwood Stephenson | 2017-12-05 |