| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 12 | |
| #2 | WIPO (World Intellectual Property Organization) | 4 | |
| #3 | EPO (European Patent Office) | 3 | |
| #4 | Canada | 2 |
| # | Industry | |
|---|---|---|
| #1 | Transport | |
| #2 | Medical technology | |
| #3 | Environmental technology | |
| #4 | Machines |
| # | Name | Total Patents |
|---|---|---|
| #1 | Johnson Daniel T | 12 |
| #2 | Wiff James W | 10 |
| #3 | Holtan Paul David | 8 |
| #4 | Holtan Paul D | 7 |
| #5 | Johnson Daniel | 2 |
| #6 | Dvorak Andrew Leonard | 1 |
| #7 | Dominguez Stephan | 1 |
| #8 | Schugt William | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US2007289787A1 | Wheelchair transporter | |
| WO2006091816A2 | Wheelchair transporter | |
| WO2006089071A2 | Push-pull cart collection device and conversion assembly | |
| US2006197295A1 | Push-pull cart collection device and conversion assembly | |
| US2006174405A1 | Patient transfer and transport bed | |
| WO2006050390A2 | Pallet cart | |
| US2006102392A1 | Bed transfer system | |
| US2004245030A1 | Cart pulling vehicle with dual cable drums and dual torsion springs | |
| US6220379B1 | Cart retriever vehicle |