| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 20 | |
| #2 | United Kingdom | 2 |
| # | Industry | |
|---|---|---|
| #1 | Machines | |
| #2 | Civil engineering | |
| #3 | Materials and metallurgy | |
| #4 | Machine tools |
| # | Technology | |
|---|---|---|
| #1 | Shaping clay | |
| #2 | Roof coverings | |
| #3 | Spraying devices | |
| #4 | Building materials | |
| #5 | Presses |
| # | Name | Total Patents |
|---|---|---|
| #1 | Ludowici Ludwig Franz | 14 |
| Publication | Filing date | Title |
|---|---|---|
| DE1011137B | Roof tiles | |
| DE916730C | Interlocking tile with several head and side ribs | |
| DE743733C | Housing with injection openings for nozzles | |
| DE913469C | Interlocking tile with stepped corners for multiple corner coverage | |
| GB373264A | Improvements in roofing tiles | |
| GB366526A | Improvements in or relating to roofing tiles |