| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 13 | |
| #2 | Switzerland | 2 | |
| #3 | United Kingdom | 2 | |
| #4 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Basic materials chemistry | |
| #2 | Foods and drinks | |
| #3 | Packaging and shipping | |
| #4 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Gas, coke and tar production | |
| #2 | Cranes | |
| #3 | Meat processing | |
| #4 | Venting or aerating devices |
| # | Name | Total Patents |
|---|---|---|
| #1 | Rudolf Wilhelm | 3 |
| #2 | Wilhelm Rudolf | 1 |
| #3 | Marcus Wilhelm | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US2007318A | Coke oven door | |
| GB350368A | Improvements in or relating to coke-oven doors | |
| DE542583C | Pressing device for coke oven doors | |
| DE559890C | Coke oven door with a blade-like metal seal | |
| GB190607067A | Improvements in Apparatus for Teaching Reckoning | |
| DE525922C | Connection for subdivided coke oven door frames |