| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 13 | |
| #2 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Agriculture | |
| #2 | Engines, pumps and turbines | |
| #3 | Electrical machinery and energy | |
| #4 | Furniture and games | |
| #5 | Machines |
| # | Technology | |
|---|---|---|
| #1 | Animal care | |
| #2 | Non-positive-displacement pumps | |
| #3 | Dynamo-electric machines | |
| #4 | Toys | |
| #5 | Unspecified technologies |
| # | Name | Total Patents |
|---|---|---|
| #1 | Eheim Gunther | 7 |
| #2 | Wiedenmann Walter | 3 |
| Publication | Filing date | Title |
|---|---|---|
| DE2416365A1 | Bottom filter for aquarium - consists of sectional, perforated filter-plate with space underneath, resting on supports on the bottom of the aquarium | |
| DE2416470A1 | Aquarium water-filter equipment - consists of filter-plate in bottom of tank beneath which water is given slight excess pressure | |
| US3892663A | Home fish-tank filter construction | |
| DE2264934A1 | Rotor bearing for motor-pump set - has bearing socket with elastic bearing cap over shaft end |