| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Austria | 4 | |
| #2 | Switzerland | 4 | |
| #3 | Spain | 4 | |
| #4 | United Kingdom | 4 | |
| #5 | United States | 2 |
| # | Industry | |
|---|---|---|
| #1 | Chemical engineering |
| # | Technology | |
|---|---|---|
| #1 | Separation |
| # | Name | Total Patents |
|---|---|---|
| #1 | Loeffler Oswald | 14 |
| #2 | Weidle Wilhelm | 4 |
| #3 | Wilhelm Weidle Dr | 3 |
| #4 | Weidle Wilhelm Dr | 2 |
| Publication | Filing date | Title |
|---|---|---|
| GB190506876A | Improvements in Filters. | |
| US815846A | Filtering material. | |
| GB190506055A | A New or Improved Filtering Material and Method of Producing same. | |
| US781536A | Filter. | |
| GB190312223A | Improvements in Filters. | |
| GB190206285A | An Improvement in Filters. |