Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4764906 | Plasma jet underwater acoustic source | Philip L. Pitt, John D. Ridley, Robert C. Smith, David Topham | 1988-08-16 |
| 4546740 | Ignition source for internal combustion engine | John D. Ridley, Philip L. Pitt | 1985-10-15 |