| # | Country | Total Patents | |
|---|---|---|---|
| #1 | France | 11 | |
| #2 | United Kingdom | 2 | |
| #3 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Transport | |
| #2 | Electrical machinery and energy | |
| #3 | Control | |
| #4 | Materials and metallurgy | |
| #5 | Machine tools | |
| #6 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Aeroplanes | |
| #2 | Systems controlling non-electric variables | |
| #3 | Casting metal | |
| #4 | Electric motor controls | |
| #5 | Gearing | |
| #6 | Presses |
| # | Name | Total Patents |
|---|---|---|
| #1 | Grosjean Marcel | 2 |
| #2 | Duchaussoy Camille-Charles | 2 |
| #3 | Duchaussoy Camille | 1 |
| #4 | Lyonnet Pierre | 1 |
| #5 | Edouard Chauviere Lucien | 1 |
| #6 | Longepierre Henri | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US2138339A | Airscrew having a variable pitch | |
| GB464835A | Improvements in or relating to air-screws | |
| GB305473A | Improvements in metallic screw propellers |