| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 49 |
| # | Industry | |
|---|---|---|
| #1 | Civil engineering | |
| #2 | Machines | |
| #3 | Machine tools | |
| #4 | Mechanical elements | |
| #5 | Electrical machinery and energy | |
| #6 | Measurement | |
| #7 | Packaging and shipping |
| # | Technology | |
|---|---|---|
| #1 | Earth drilling | |
| #2 | Unspecified technologies | |
| #3 | Unspecified technologies | |
| #4 | Turning | |
| #5 | Cranes | |
| #6 | Gearing | |
| #7 | Measuring length, angles and areas | |
| #8 | Venting or aerating devices | |
| #9 | Accessories for machine tools | |
| #10 | Electric switches |
| # | Name | Total Patents |
|---|---|---|
| #1 | Johnson Glenn D | 21 |
| #2 | Brown Ora A | 6 |
| #3 | Baash Lawrence F | 4 |
| #4 | Long Spencer W | 4 |
| #5 | Wickersham Harry P | 3 |
| #6 | Blasito Bronzan | 3 |
| #7 | Fisher Ralph D | 2 |
| #8 | Erwin Burns | 2 |
| #9 | Hardies Charles H | 2 |
| #10 | Yarbrough Harold C | 1 |
| Publication | Filing date | Title |
|---|---|---|
| US2663086A | Caliper for threaded joints | |
| US2681794A | Traveling block and connector | |
| US2575627A | Crown block safety switch | |
| US2587105A | Shock-absorber for rotary drilling kellys | |
| US2527225A | Means for controlling pressure in drilling wells | |
| US2532408A | Casing head | |
| US2469772A | Casing head | |
| US2359919A | Crown block | |
| US2442544A | Liner hanger | |
| US2301377A | Rotary releasing socket | |
| US2301625A | Safety clamp | |
| US2334309A | Well tool construction | |
| US2307275A | Drilling safety joint | |
| US2313243A | Elevator link | |
| US2263758A | Pin tap | |
| US2303556A | Liner hanger | |
| US2285281A | Apparatus for surveying articles of manufacture | |
| US2245979A | Slip | |
| US2306130A | Well drilling apparatus | |
| US2265660A | Swabbing valve |