- All sections
- E - Fixed constructions
- E21B - Earth or rock drilling; obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B 33/16 - Methods or devices for cementing, for plugging holes, crevices, or the like for cementing casings into boreholes using plugs for isolating cement charge; Plugs therefor
Patent holdings for IPC class E21B 33/16
Total number of patents in this class: 560
10-year publication summary
|
37
|
38
|
33
|
54
|
34
|
44
|
47
|
58
|
38
|
21
|
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Halliburton Energy Services, Inc. | 20165 |
151 |
| Weatherford Technology Holdings, LLC | 2135 |
50 |
| Saudi Arabian Oil Company | 11322 |
45 |
| Gulfstream Services, Inc. | 53 |
33 |
| Baker Hughes Oilfield Operations, LLC | 1885 |
14 |
| Schlumberger Technology Corporation | 9690 |
13 |
| Schlumberger Canada Limited | 6913 |
13 |
| Mako Rentals, Inc. | 61 |
13 |
| Weatherford Netherlands, B.V. | 17 |
13 |
| Schlumberger Technology B.v. | 4951 |
12 |
| Baker Hughes Incorporated | 5689 |
12 |
| Services Petroliers Schlumberger | 5426 |
11 |
| ConocoPhillips Company | 1657 |
8 |
| Prad Research and Development Limited | 2696 |
8 |
| Schlumberger Holdings Limited | 2947 |
7 |
| Innovex Downhole Solutions, Inc. | 182 |
7 |
| Vertice Oil Tools | 37 |
6 |
| Deltatek Oil Tools Limited | 23 |
6 |
| CURTIS, Philip, Anthony | 497 |
6 |
| Nabors Drilling Technologies USA, Inc. | 533 |
5 |
| Other owners | 127 |