| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 7 | |
| #2 | Canada | 3 | |
| #3 | Netherlands | 3 | |
| #4 | Austria | 1 | |
| #5 | United Kingdom | 1 | |
| #6 | Japan | 1 |
| # | Industry | |
|---|---|---|
| #1 | Mechanical elements | |
| #2 | Machines | |
| #3 | Measurement |
| # | Technology | |
|---|---|---|
| #1 | Unspecified technologies | |
| #2 | Venting or aerating devices | |
| #3 | Testing of structures | |
| #4 | Pipes | |
| #5 | Servomotors |
| # | Name | Total Patents |
|---|---|---|
| #1 | Ledeen Howard L | 7 |
| #2 | Schmon Franz | 6 |
| #3 | Tupker Willem E | 3 |
| #4 | Ledeen William P | 1 |
| #5 | Mittal Chander P | 1 |
| #6 | Williams Jack L | 1 |
| #7 | Furantsu Shiyumon | 1 |
| #8 | Tupker W | 1 |
| #9 | Hawaado Eru Redeiin | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US4542814A | System for precise valve control | |
| US4307750A | System for precise position control | |
| US4109512A | Linebreak detection system | |
| US4092877A | Selective mode handwheel valve operator | |
| US4051715A | Linebreak detection system | |
| US4051676A | Hydraulic valve actuator | |
| US3760480A | Valve operator and method of making the same |