| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 11 | |
| #2 | France | 3 | |
| #3 | Austria | 2 | |
| #4 | Switzerland | 2 | |
| #5 | Netherlands | 2 | |
| #6 | German Democratic Republic | 1 | |
| #7 | EPO (European Patent Office) | 1 | |
| #8 | Greece | 1 | |
| #9 | Italy | 1 | |
| #10 | Norway | 1 | |
| #11 | Sweden | 1 | |
| #12 | USSR (Union of Socialist Soviet Republics) | 1 | |
| #13 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Environmental technology | |
| #3 | Machines | |
| #4 | Agriculture | |
| #5 | Optics | |
| #6 | Consumer goods |
| # | Technology | |
|---|---|---|
| #1 | Sewers | |
| #2 | Domestic plumbing installations | |
| #3 | Climate change adaptation technologies | |
| #4 | Unspecified technologies | |
| #5 | Ladders | |
| #6 | Animal care | |
| #7 | Footwear features | |
| #8 | Indexing scheme relating to hinges | |
| #9 | Spectacles | |
| #10 | Hinges for doors or windows |
| # | Name | Total Patents |
|---|---|---|
| #1 | Klenk Adam | 13 |
| #2 | Klenk Helmut | 4 |
| #3 | Klenk A | 3 |
| #4 | Klenk H | 3 |
| #5 | Klenk Khelmut | 1 |
| Publication | Filing date | Title |
|---|---|---|
| DE3941121A1 | Step-ladder foot extension - has separate guide for adjustable foot-rail secured to ladder upright | |
| DE3419791A1 | Dirt-repelling profiled sole | |
| DE3123270A1 | Adjustable door hinge | |
| DE3039790A1 | Road manhole cover lock - has inclined lug face engaging frames downward inclined support cam face | |
| DE3016264A1 | Stepladder | |
| US4215716A | One-way conduit closure | |
| SU589938A3 | Sewage siphon lock for liquids | |
| NO741616L | BACKLIGHT AND LUBRICANTS FOR LIQUIDS. |