| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 26 | |
| #2 | Canada | 2 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Mechanical elements | |
| #3 | Machines | |
| #4 | Engines, pumps and turbines |
| # | Technology | |
|---|---|---|
| #1 | Earth drilling | |
| #2 | Unspecified technologies | |
| #3 | Pistons and sealings | |
| #4 | Gearing | |
| #5 | Unspecified technologies | |
| #6 | Venting or aerating devices | |
| #7 | Pipes | |
| #8 | Springs | |
| #9 | Pumps |
| # | Name | Total Patents |
|---|---|---|
| #1 | Wigle Wilson B | 28 |
| #2 | Walter Hughes | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US1842638A | Elevating apparatus | |
| US1863890A | Combination casing head and casing support | |
| US1836419A | Control head for oil and gas wells | |
| US1766368A | Oil-well fishing tool | |
| US1804581A | Stuffing box | |
| US1836565A | Control head for oil and gas wells | |
| US1738860A | Hydraulic rotary underreamer | |
| US1627945A | Casing head for oil wells | |
| US1460632A | Centering cementing shoe | |
| US1349030A | Wheel-gudgeon | |
| US1342141A | Clamp | |
| US1448100A | Elevator | |
| US1356951A | Underreamer | |
| US1362456A | Pump | |
| CA178862A | Casing head | |
| US1273708A | Underreamer. | |
| US1243648A | Pump-packing expander. | |
| US1223303A | Bull and calf wheel. | |
| US1213785A | Band-wheel construction. | |
| CA174010A | Hook |