- 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 33/08 - WipersOil savers
Patent holdings for IPC class E21B 33/08
Total number of patents in this class: 584
10-year publication summary
|
52
|
57
|
57
|
44
|
43
|
48
|
42
|
31
|
38
|
28
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Weatherford Technology Holdings, LLC | 2023 |
80 |
| Halliburton Energy Services, Inc. | 20891 |
41 |
| Pruitt Tool & Supply Co. | 69 |
37 |
| Schlumberger Technology Corporation | 10717 |
36 |
| Grant Prideco, Inc. | 386 |
34 |
| Mako Rentals, Inc. | 60 |
18 |
| Schlumberger Canada Limited | 7296 |
17 |
| Schlumberger Technology B.v. | 5168 |
17 |
| Services Petroliers Schlumberger | 5788 |
17 |
| Beyond Energy Services and Technology Corp. | 16 |
12 |
| Anti-Pollution Technology, L.P. | 16 |
11 |
| National Oilwell Varco, L.P. | 1671 |
10 |
| Saudi Arabian Oil Company | 13155 |
10 |
| Katch Kan Holdings Ltd. | 55 |
9 |
| Reform Energy Services Corp. | 11 |
7 |
| Weatherford / Lamb, Inc. | 153 |
6 |
| Baker Hughes Holdings LLC | 3007 |
6 |
| Baker Hughes Incorporated | 5247 |
5 |
| Cameron International Corporation | 1332 |
5 |
| ConocoPhillips Company | 1673 |
5 |
| Other owners | 201 |