| # | Country | Total Patents | |
|---|---|---|---|
| #1 | Germany | 3 | |
| #2 | Japan | 3 | |
| #3 | United States | 3 | |
| #4 | Canada | 2 | |
| #5 | United Kingdom | 2 |
| # | Industry | |
|---|---|---|
| #1 | Machines | |
| #2 | Mechanical elements | |
| #3 | Engines, pumps and turbines |
| # | Technology | |
|---|---|---|
| #1 | Unspecified technologies | |
| #2 | Venting or aerating devices | |
| #3 | Rotary-pistons |
| # | Name | Total Patents |
|---|---|---|
| #1 | Lemmon John C | 6 |
| #2 | Zepernick Dean E | 3 |
| #3 | Olson Donald R | 3 |
| #4 | White Ira G | 1 |
| #5 | Jiyon Shii Shimon | 1 |
| #6 | Jiyon Shii Remon | 1 |
| #7 | Spitz Russell W | 1 |
| #8 | Donarudo Aaru Oruson | 1 |
| #9 | Deiin Ii Zetsupaanitsuku | 1 |
| #10 | Ratsuseru Daburiyu Supitsutsu | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US4253808A | Hydraulic pumps | |
| GB1532725A | Fluid control valve | |
| US4167262A | Pilot actuated valve | |
| US4096880A | Cartridge valve |