| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 26 | |
| #2 | Canada | 4 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Mechanical elements | |
| #3 | Machines | |
| #4 | Engines, pumps and turbines |
| # | Technology | |
|---|---|---|
| #1 | Earth drilling | |
| #2 | Venting or aerating devices | |
| #3 | Unspecified technologies | |
| #4 | Pistons and sealings | |
| #5 | Shafts | |
| #6 | Machines |
| # | Name | Total Patents |
|---|---|---|
| #1 | Heggem Alfred G | 30 |
| #2 | Ritter Gilbert P | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US2277975A | Valve | |
| US2200474A | Valve actuating mechanism | |
| US2039220A | Valve | |
| US1989009A | Valve | |
| US1985449A | Valve | |
| US1908421A | Pipe gripping device | |
| US1949834A | Valve | |
| US1982252A | Oil saver | |
| US1935027A | Packing casing head | |
| US1973809A | Tubing top | |
| US1881555A | Oil saver | |
| US1888000A | Valve | |
| US1881556A | Packing casing head | |
| US1891417A | Stuffing box | |
| US1799297A | Stuffing box | |
| US1803471A | Stuffing box | |
| US1723934A | Casing head | |
| US1695014A | Valve | |
| US1540263A | Casing head | |
| US1495845A | Casing head |