| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United Kingdom | 5 | |
| #2 | Canada | 2 | |
| #3 | Denmark | 2 | |
| #4 | Norway | 2 | |
| #5 | Australia | 1 | |
| #6 | EPO (European Patent Office) | 1 | |
| #7 | United States | 1 | |
| #8 | WIPO (World Intellectual Property Organization) | 1 |
| # | Industry | |
|---|---|---|
| #1 | Transport |
| # | Technology | |
|---|---|---|
| #1 | Convertible vehicles | |
| #2 | Motor vehicles | |
| #3 | Dry-docking of vessels |
| # | Name | Total Patents |
|---|---|---|
| #1 | Royle David Albert Cyril | 7 |
| #2 | Royle David A C | 3 |
| Publication | Filing date | Title |
|---|---|---|
| AU3506493A | Vehicle with retractable wheel | |
| GB9202834D0 | Improvements in retractable wheels | |
| GB9022883D0 | Amphibious craft | |
| GB9009576D0 | Amphibious craft | |
| US5176098A | Retractable wheels |