| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 4 | |
| #2 | Australia | 3 | |
| #3 | WIPO (World Intellectual Property Organization) | 3 | |
| #4 | Brazil | 2 | |
| #5 | China | 2 |
| # | Industry | |
|---|---|---|
| #1 | Chemical engineering | |
| #2 | Environmental technology | |
| #3 | Machines |
| # | Technology | |
|---|---|---|
| #1 | Drying solid materials by removing liquid | |
| #2 | Cremation furnaces | |
| #3 | Solid waste disposal | |
| #4 | Separation | |
| #5 | Cyclones |
| # | Name | Total Patents |
|---|---|---|
| #1 | Walker David Ray | 10 |
| #2 | Walker David R | 4 |
| Publication | Filing date | Title |
|---|---|---|
| US5137545A | Vapor clarification system and method | |
| US5052313A | Waste treatment system and method | |
| US5080581A | Method and apparatus for drying waste materials |