| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 54 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Machines | |
| #3 | Engines, pumps and turbines | |
| #4 | Mechanical elements | |
| #5 | Machine tools |
| # | Technology | |
|---|---|---|
| #1 | Earth drilling | |
| #2 | Unspecified technologies | |
| #3 | Pumps | |
| #4 | Venting or aerating devices | |
| #5 | Unspecified technologies | |
| #6 | Siphons | |
| #7 | Pipes | |
| #8 | Sawing |
| # | Name | Total Patents |
|---|---|---|
| #1 | Church Walter L | 54 |
| #2 | Holleron William K | 3 |
| #3 | Church Carroll E | 1 |
| #4 | Pearce Louis M | 1 |
| #5 | Clark Jack K | 1 |
| #6 | Pearce William L | 1 |
| #7 | Nixon Jeddy D | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US2931670A | Fluid tight pipe joint with replaceable means for preventing overtightening | |
| US2905438A | Fluid driven core drilling apparatus | |
| US2905251A | Gravel packed screen | |
| US2906283A | Choke | |
| US2866508A | Gun test packer | |
| US2815081A | Packer setting tool | |
| US2842343A | Retractible bit | |
| US2807326A | Packer for well casing | |
| US2766830A | Control heads | |
| US2670181A | Reversing tool | |
| US2691383A | Gas lift valve | |
| US2611582A | Side wall coring tool | |
| US2624362A | Flow valve for fluid lift pumps | |
| US2612066A | Tong | |
| US2500276A | Safety joint | |
| US2572318A | Pipe holding slip | |
| US2461107A | Safety joint | |
| US2422223A | Safety joint | |
| US2364600A | Well pump | |
| US2404692A | Packer anchor |