Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10260379 | Cryogenic engine system | Michael Dearman, Don Old, Henry Clarke, Difei Zhao | 2019-04-16 |
| 9388711 | Cryogenic engine system | Michael Ayres, Henry Clarke, Dongsheng Wen | 2016-07-12 |
| 6983598 | Engines driven by liquified or compressed gas | — | 2006-01-10 |
| 5651361 | Breathing apparatus | Howard A. Buckenham, Kevin D. J. Bowden, Andrew Peter Sharpe, Damon Andrew Cookman | 1997-07-29 |
| 5537999 | Breathing apparatus | Howard A. Buckenham, Kevin D. J. Bowden, Andrew Peter Sharpe, Damon Andrew Cookman | 1996-07-23 |
| 5241955 | Breathing apparatus | Richard E. Smith | 1993-09-07 |
| 5183037 | Resuscitator valve | — | 1993-02-02 |