| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 12 | |
| #2 | Canada | 1 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Machines |
| # | Technology | |
|---|---|---|
| #1 | Earth drilling | |
| #2 | Unspecified technologies |
| # | Name | Total Patents |
|---|---|---|
| #1 | Rasmussen Chester A | 13 |
| #2 | Trout William A | 7 |
| #3 | Butler Charles R | 3 |
| #4 | Clark Robert M | 1 |
| #5 | Rinehart William H | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US1859793A | Casing head | |
| US1842116A | Plug for well tubes | |
| US1872498A | Blow-out preventer | |
| US1836506A | Blow-out preventer | |
| US1836507A | Device for sealing flowing wells and stopping the engines | |
| US1709949A | Automatic seal-control blow-out preventer | |
| US1807046A | Casing support | |
| US1739802A | Packed casing head | |
| US1664643A | Capping device for oil wells | |
| US1590645A | Valve mechanism for inner drill-casing tubes | |
| US1464585A | Packing means for well casings | |
| US1170329A | Tool-fishing socket. | |
| CA262264A | Well casing head |