| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 8 | |
| #2 | Spain | 3 |
| # | Industry | |
|---|---|---|
| #1 | Transport | |
| #2 | Furniture and games | |
| #3 | Machines |
| # | Technology | |
|---|---|---|
| #1 | Aeroplanes | |
| #2 | Toys | |
| #3 | Convertible vehicles | |
| #4 | Unspecified technologies |
| # | Name | Total Patents |
|---|---|---|
| #1 | Main David W | 8 |
| Publication | Filing date | Title |
|---|---|---|
| US3063191A | Toy airplane | |
| US2615281A | Flying toy | |
| US2413460A | Airplane | |
| US2410545A | Pitch control mechanism for rotors of rotary wing aircraft | |
| US2389798A | Pitch control device for rotor blades | |
| US2436113A | Airplane propeller | |
| US2397189A | Airplane | |
| ES141542A1 | Improvements in the construction of vehicles for taxi or road. | |
| ES141540A1 | Improvements in the construction of vehicles for taxi or road. | |
| ES141541A1 | Improvements in the construction of vehicles for taxi or road. | |
| US2043703A | Vehicle guide means |