- All sections
- E - Fixed constructions
- E21B - Earth or rock drillingobtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B 17/042 - CouplingsJoints between rod and bit, or between rod and rod threaded
Patent holdings for IPC class E21B 17/042
Total number of patents in this class: 1561
10-year publication summary
133
|
131
|
146
|
119
|
121
|
139
|
143
|
101
|
83
|
38
|
2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
Owner |
All patents
|
This class
|
---|---|---|
Vallourec Oil and Gas France | 453 |
179 |
Nippon Steel Corporation | 6203 |
125 |
Halliburton Energy Services, Inc. | 20835 |
68 |
Sandvik Mining and Construction Tools AB | 173 |
43 |
Schlumberger Technology Corporation | 10662 |
33 |
National Oilwell Varco, L.P. | 1661 |
30 |
Sandvik Intellectual Property AB | 1484 |
29 |
Weatherford Technology Holdings, LLC | 2015 |
27 |
Hydril Company | 93 |
27 |
Baker Hughes Oilfield Operations, LLC | 2288 |
27 |
Nippon Steel & Sumitomo Metal Corporation | 1988 |
25 |
Tenaris Connections B.V. | 167 |
24 |
JFE Steel Corporation | 6809 |
23 |
Evolution Engineering Inc. | 301 |
22 |
Saudi Arabian Oil Company | 12947 |
19 |
Schlumberger Canada Limited | 7273 |
17 |
Boart Longyear Manufacturing and Distribution Inc. | 112 |
17 |
Schlumberger Technology B.v. | 5161 |
16 |
Baker Hughes Incorporated | 5277 |
16 |
Services Petroliers Schlumberger | 5772 |
16 |
Other owners | 778 |