| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 15 |
| # | Industry | |
|---|---|---|
| #1 | Transport | |
| #2 | Civil engineering | |
| #3 | Environmental technology | |
| #4 | Weapons |
| # | Technology | |
|---|---|---|
| #1 | Ships | |
| #2 | Hydraulic engineering | |
| #3 | Ship-lifting devices | |
| #4 | Climate change adaptation technologies | |
| #5 | Armour | |
| #6 | Railway systems | |
| #7 | Machines for making railways | |
| #8 | Locomotives |
| Publication | Filing date | Title |
|---|---|---|
| DE396543C | Ship lock | |
| DE384342C | Ship lock with facilities for quick filling and emptying of the chamber |