| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Japan | 61 |
| # | Industry | |
|---|---|---|
| #1 | Mechanical elements | |
| #2 | Machines | |
| #3 | Civil engineering | |
| #4 | Control | |
| #5 | Packaging and shipping | |
| #6 | Electrical machinery and energy | |
| #7 | Engines, pumps and turbines | |
| #8 | Transport |
| # | Name | Total Patents |
|---|---|---|
| #1 | Pfaff Joseph L | 23 |
| #2 | Stephenson Dwight B | 15 |
| #3 | Tabor Keith A | 14 |
| #4 | Hamkins Eric P | 6 |
| #5 | Yang Xiaolong | 5 |
| #6 | Barber Dennis R | 4 |
| #7 | Paik Michael J | 4 |
| #8 | Jackson Randall S | 3 |
| #9 | Pack Andreas S | 2 |
| #10 | Pieper Gary J | 2 |
| Publication | Filing date | Title |
|---|---|---|
| JP2008121893A | Energy recovery and reuse technique for hydraulic system | |
| JP2008267595A | Energy recovery and reuse technology for hydraulic system | |
| JP2005273911A | Hydraulic system control method using differential pressure compensation discharge coefficient |