| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Canada | 6 | |
| #2 | United States | 5 |
| # | Industry | |
|---|---|---|
| #1 | Chemical engineering | |
| #2 | Environmental technology |
| # | Technology | |
|---|---|---|
| #1 | Drying solid materials by removing liquid | |
| #2 | Garbage disposal | |
| #3 | Chemical leather treatments |
| # | Name | Total Patents |
|---|---|---|
| #1 | Welch John B | 11 |
| #2 | Welch William C | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US1817402A | Drying apparatus | |
| US1753974A | Progressive dry kiln and method of drying lumber | |
| US1579264A | Process for finishing leather | |
| US1517928A | Drying apparatus | |
| US1325769A | Receptacle for inflammable materials. | |
| CA260883A | Drying apparatus | |
| CA260884A | Lumber drying kiln | |
| CA261310A | Wood drier | |
| CA261312A | Wood drier | |
| CA261311A | Wood drier | |
| CA267865A | Wood drier |