Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11459890 | Rotary engine rotor with lip and a recess on the flank | Roy Richmond, Christopher John Biddulph | 2022-10-04 |
| 9518658 | Rotary engine rotor | Christopher John Biddulph | 2016-12-13 |