| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 14 | |
| #2 | Canada | 3 | |
| #3 | United Kingdom | 1 |
| # | Industry | |
|---|---|---|
| #1 | Mechanical elements | |
| #2 | Machines | |
| #3 | Engines, pumps and turbines | |
| #4 | Environmental technology |
| # | Name | Total Patents |
|---|---|---|
| #1 | Rogers Frank H | 5 |
| #2 | Kruse Otto V | 4 |
| #3 | Larner Chester W | 2 |
| #4 | Brunswick Sharp Robert Edward | 2 |
| #5 | Sheppard Howard M | 2 |
| #6 | Birchard Taylor Harvey | 1 |
| #7 | August Klouman Fredrick | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US1751667A | Hydraulic apparatus | |
| US1779191A | Hydraulic apparatus | |
| GB278311A | Valves | |
| US1813126A | Valve | |
| US1716328A | Adjustable vane runner | |
| US1769845A | Control means for valves | |
| US1725421A | Gate-operating mechanism | |
| US1841608A | Check valve | |
| US1834870A | Valve | |
| US1750805A | Fluid-control system | |
| US1734733A | Valve | |
| US1725420A | Gate-operating mechanism | |
| US1723736A | Valve | |
| US1636661A | Double-plunger valve | |
| CA275299A | Valve | |
| CA283077A | Valve | |
| CA275300A | Valve |