| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 9 | |
| #2 | Argentina | 1 | |
| #3 | Austria | 1 | |
| #4 | Australia | 1 | |
| #5 | Brazil | 1 | |
| #6 | Canada | 1 | |
| #7 | Switzerland | 1 | |
| #8 | EPO (European Patent Office) | 1 | |
| #9 | Spain | 1 | |
| #10 | France | 1 | |
| #11 | Ireland | 1 | |
| #12 | Italy | 1 | |
| #13 | Japan | 1 | |
| #14 | Netherlands | 1 | |
| #15 | Sweden | 1 | |
| #16 | USSR (Union of Socialist Soviet Republics) | 1 | |
| #17 | United States | 1 | |
| #18 | WIPO (World Intellectual Property Organization) | 1 |
| # | Industry | |
|---|---|---|
| #1 | Chemical engineering | |
| #2 | Textiles and paper | |
| #3 | Measurement | |
| #4 | Civil engineering |
| # | Technology | |
|---|---|---|
| #1 | Separation | |
| #2 | Special textiles | |
| #3 | Woven fabrics | |
| #4 | Shafts | |
| #5 | Measuring volume |
| # | Name | Total Patents |
|---|---|---|
| #1 | Friedrichs Dieter | 14 |
| #2 | Friedrichs D | 2 |
| #3 | Deiiteru Furiidoritsuhisu | 1 |
| #4 | Fridrikhs Diter | 1 |
| Publication | Filing date | Title |
|---|---|---|
| DE3934947A1 | Backwash filter | |
| DE3918308A1 | Flow indicator | |
| WO8901358A1 | Filter candle | |
| DE3705803A1 | Backwash filter | |
| DE3526746A1 | Safety filter for stamps or treadmills | |
| DE3326288A1 | Filter cartridge for filter apparatus | |
| DE2640569A1 | Support for woven filter media - having grid of support rods with narrow gaps to provide back up filter | |
| AU8636475A | Filter fabric | |
| ES442270A1 | Mesh weave filter | |
| DE2531752A1 | Filter cloth of composite weave - with double interlocking weft strands flattened at their points of intersection | |
| DE2454390A1 | Woven filtering fabric of metal or synthetic material - has large filaments and small filaments which determines size of pores |