| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 5 | |
| #2 | WIPO (World Intellectual Property Organization) | 3 | |
| #3 | Australia | 2 | |
| #4 | Canada | 1 | |
| #5 | EPO (European Patent Office) | 1 | |
| #6 | Mexico | 1 | |
| #7 | New Zealand | 1 |
| # | Industry | |
|---|---|---|
| #1 | Transport |
| # | Technology | |
|---|---|---|
| #1 | Marine propulsion |
| # | Name | Total Patents |
|---|---|---|
| #1 | Speer Stephen R | 14 |
| Publication | Filing date | Title |
|---|---|---|
| US5368442A | Automatic variable discrete pitch marine propeller | |
| US5240374A | Damped automatic variable pitch marine propeller | |
| US5129785A | Automatic variable discrete pitch marine propeller | |
| US5032057A | Automatic variable pitch marine propeller | |
| US4929153A | Self-actuating variable pitch marine propeller |