| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 6 | |
| #2 | EPO (European Patent Office) | 3 | |
| #3 | Switzerland | 2 | |
| #4 | United States | 2 |
| # | Industry | |
|---|---|---|
| #1 | Mechanical elements | |
| #2 | Machines | |
| #3 | Control | |
| #4 | Measurement |
| # | Technology | |
|---|---|---|
| #1 | Unspecified technologies | |
| #2 | Venting or aerating devices | |
| #3 | Servomotors | |
| #4 | Systems controlling non-electric variables | |
| #5 | Measuring volume | |
| #6 | Gearing |
| # | Name | Total Patents |
|---|---|---|
| #1 | Pieren Heinz | 7 |
| #2 | Gerber Juerg | 4 |
| #3 | Szikra Mihaly | 2 |
| #4 | Heinz Pieren | 1 |
| #5 | Baumgartner Elmar | 1 |
| Publication | Filing date | Title |
|---|---|---|
| DE19723219A1 | Hydraulic multi-way valve, in particular steering type selector valve for multi-axle steered vehicles | |
| DE4330073A1 | Pilot operated hydraulic valve | |
| DE4329327A1 | Control unit for a hydraulic drive system, in particular a double travel brake valve | |
| DE4125238A1 | Flow regulating valve - has flow set by flow restrictor set into pressure balancing piston to maintain constant output over varying load conditions | |
| CH662870A5 | Pilot-controlled pressure relief (control) valve | |
| DE3444752A1 | Flow measuring device |