| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Switzerland | 3 | |
| #2 | France | 3 | |
| #3 | United States | 3 | |
| #4 | United Kingdom | 2 |
| # | Industry | |
|---|---|---|
| #1 | Chemical engineering | |
| #2 | Machine tools | |
| #3 | Machines | |
| #4 | Basic materials chemistry | |
| #5 | Materials and metallurgy | |
| #6 | Engines, pumps and turbines |
| # | Technology | |
|---|---|---|
| #1 | Mixing | |
| #2 | Chemical or physical processes | |
| #3 | Spraying devices | |
| #4 | Punching metal | |
| #5 | Soaps | |
| #6 | Rotary pistons | |
| #7 | Non-metallic elements | |
| #8 | Making metal sheets |
| # | Name | Total Patents |
|---|---|---|
| #1 | Pfrengle Otto | 3 |
| #2 | Otto Pfrengle | 3 |
| #3 | Ladisch Gerhard | 2 |
| Publication | Filing date | Title |
|---|---|---|
| US3929291A | Spray mixing nozzle | |
| CH509833A | Sprinkler plant for wetting powdered - materials | |
| US987598A | Tube-rolling machine. | |
| GB190928073A | Improvements in Bending Machines for Making Metal Tubes. |