| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Canada | 2 | |
| #2 | Austria | 1 | |
| #3 | Australia | 1 | |
| #4 | Brazil | 1 | |
| #5 | Switzerland | 1 | |
| #6 | Germany | 1 | |
| #7 | Denmark | 1 | |
| #8 | Spain | 1 | |
| #9 | Finland | 1 | |
| #10 | France | 1 | |
| #11 | United Kingdom | 1 | |
| #12 | Israel | 1 | |
| #13 | Netherlands | 1 | |
| #14 | Norway | 1 | |
| #15 | Sweden | 1 | |
| #16 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Chemical engineering |
| # | Technology | |
|---|---|---|
| #1 | Separation |
| # | Name | Total Patents |
|---|---|---|
| #1 | Welles Donald P Jr | 4 |
| #2 | Welles Jr Donald P | 2 |
| #3 | Welles Jr D P | 2 |
| #4 | Welles Jun Donald P | 1 |
| #5 | Welles D | 1 |
| Publication | Filing date | Title |
|---|---|---|
| IL46322D0 | Screening apparatus | |
| CA1022857A | Rotary screen filter with continuous cleaning |