| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 11 |
| # | Industry | |
|---|---|---|
| #1 | Mechanical elements | |
| #2 | Machines | |
| #3 | Packaging and shipping | |
| #4 | Engines, pumps and turbines | |
| #5 | Civil engineering |
| # | Technology | |
|---|---|---|
| #1 | Venting or aerating devices | |
| #2 | Unspecified technologies | |
| #3 | Pumps | |
| #4 | Transferring liquids | |
| #5 | Earth drilling |
| # | Name | Total Patents |
|---|---|---|
| #1 | Greenwood Dolphice H | 11 |
| Publication | Filing date | Title |
|---|---|---|
| US2870987A | Gate valve and sealing means therefor | |
| US2820482A | Line blind gate valve | |
| US2811179A | Tank car loader | |
| US2709455A | Line blind valve | |
| US2665714A | Valve | |
| US2151098A | Return flow check and plug valve | |
| US2121031A | Valve construction | |
| US2021358A | Lubricated stopcock | |
| US1666621A | Combination sucker-rod elevator and spider | |
| US1558867A | Plunger | |
| US1529178A | Safety valve for fluid driven motors |