| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 12 |
| # | Industry | |
|---|---|---|
| #1 | Machines | |
| #2 | Mechanical elements | |
| #3 | Machine tools | |
| #4 | Engines, pumps and turbines |
| # | Name | Total Patents |
|---|---|---|
| #1 | Sparks Stanley W | 5 |
| #2 | Porter Harper R | 5 |
| #3 | Lloyd Jones | 1 |
| #4 | Frayer Lee A | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US1772086A | Check valve | |
| US1799390A | Method of making a valve assembly | |
| US1742319A | Valve | |
| US1733276A | Check or globe valve | |
| US1745189A | Angle or cross valve | |
| US1788000A | Valve superstructure | |
| US1708851A | Gate valve | |
| US1648071A | Gate valve | |
| US1752657A | Gate valve | |
| US1828478A | Gate valve and method of making same | |
| US1733226A | Method of making valve casings | |
| US913121A | Valve control. |