| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 9 | |
| #2 | United Kingdom | 4 | |
| #3 | United States | 3 |
| # | Industry | |
|---|---|---|
| #1 | Chemical engineering | |
| #2 | Packaging and shipping | |
| #3 | Environmental technology | |
| #4 | Textiles and paper | |
| #5 | Mechanical elements | |
| #6 | Consumer goods | |
| #7 | Civil engineering |
| # | Technology | |
|---|---|---|
| #1 | Separation | |
| #2 | Handling thin material | |
| #3 | Water treatment | |
| #4 | Hydraulic engineering | |
| #5 | Making paper goods | |
| #6 | Chemical or physical processes | |
| #7 | Wind musical instruments | |
| #8 | Gearing |
| # | Name | Total Patents |
|---|---|---|
| #1 | Alfred Kretzschmar | 3 |
| #2 | Kretzschmar Alfred | 2 |
| Publication | Filing date | Title |
|---|---|---|
| GB756735A | Improvements in and relating to filters | |
| US2750748A | Retaining dam provided with a waterproof lining | |
| US2677433A | Process and apparatus for degassing boiler feed water | |
| GB696932A | Improvements in water filters | |
| US1871122A | Filter for liquids | |
| GB369867A | Improvements in or relating to machines for gumming or pasting patterns or samples | |
| GB357437A | Improvements in or relating to machines for gumming or pasting patterns or samples |