| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 11 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Machines | |
| #3 | Mechanical elements | |
| #4 | Engines, pumps and turbines |
| # | Technology | |
|---|---|---|
| #1 | Earth drilling | |
| #2 | Unspecified technologies | |
| #3 | Unspecified technologies | |
| #4 | Pipes | |
| #5 | Platform constructions | |
| #6 | Nails | |
| #7 | Pumps |
| # | Name | Total Patents |
|---|---|---|
| #1 | Shaffer Ernest J | 11 |
| Publication | Filing date | Title |
|---|---|---|
| US2211173A | Pipe coupling | |
| US1729494A | Combination sucker rod and box socket | |
| US1737029A | Sucker-rod elevator | |
| US1687520A | Pick-up iron | |
| US1709234A | Safety hook | |
| US1709235A | Connecting device | |
| US1684974A | Spider for sucker rods and the like | |
| US1546146A | Signaling device | |
| US1451275A | Sucker-rod slip socket | |
| US1452937A | Sucker-rod-connecting means | |
| US1750906A | Slip socket |