| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 13 |
| # | Industry | |
|---|---|---|
| #1 | Machines | |
| #2 | Mechanical elements | |
| #3 | Engines, pumps and turbines | |
| #4 | Agriculture |
| # | Technology | |
|---|---|---|
| #1 | Unspecified technologies | |
| #2 | Venting or aerating devices | |
| #3 | Unspecified technologies | |
| #4 | Pumps | |
| #5 | Animal catching |
| # | Name | Total Patents |
|---|---|---|
| #1 | Richardson Maurice F | 13 |
| Publication | Filing date | Title |
|---|---|---|
| US2117504A | Group valve unit | |
| US2082512A | Valve | |
| US2090486A | Valve | |
| US1987974A | Valve | |
| US2016390A | Valve | |
| US1959644A | Valve | |
| US1977806A | Valve | |
| US1900736A | Valve | |
| US1993567A | Valve | |
| US1789711A | Valve | |
| US1681364A | Valve | |
| US1551697A | Spring for checks and valves | |
| US1048586A | Spring-trap. |