Liquid-cooled fracturing system
US-12503935-B2 · Dec 23, 2025 · US
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Lubricating oil condition
Lubricating oil condition · Cooperative Patent Classification (CPC)
Engines, pumps, lighting, heating, and mechanical systems.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | F04B2201/0404 |
| Official title | Lubricating oil condition |
| Display label | Lubricating oil condition |
| Total patents | 17 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is stable.
| Year | Patents |
|---|---|
| 2015 | 1 |
| 2016 | 1 |
| 2017 | 1 |
| 2018 | 2 |
| 2019 | 1 |
| 2020 | 2 |
| 2021 | 4 |
| 2023 | 1 |
| 2024 | 2 |
| 2025 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Hydraulic fracturing pump health and performance monitoring using IoT sensor networks
US-12366242-B2 · Jul 22, 2025 · US
Method for monitoring the oil level of an oil-lubricated compressor, oil level monitoring system for carrying out the method and compressor system having such an oil level monitoring system
US-2024200545-A1 · Jun 20, 2024 · US
Liquid-cooled fracturing system
US-2024102359-A1 · Mar 28, 2024 · US
Hydraulic fracturing pump health and performance monitoring using iot sensor networks
US-2023044928-A1 · Feb 9, 2023 · US
Oil mist measurement device and method and compression system
US-2021372420-A1 · Dec 2, 2021 · US
Refrigerant compressor
US-2021108633-A1 · Apr 15, 2021 · US
Monitoring lubricant in hydraulic fracturing pump system
US-10969375-B1 · Apr 6, 2021 · US
Refrigerant compressor
US-10914301-B2 · Feb 9, 2021 · US
Oil sensor for a compressor
US-10816465-B2 · Oct 27, 2020 · US
Oil distributing device and refrigeration system having the oil distributing device
US-2020003464-A1 · Jan 2, 2020 · US
Monitoring lubricant in hydraulic fracturing pump system
US-10436766-B1 · Oct 8, 2019 · US
Oil level detecting apparatus and control method thereof, oil flow detecting apparatus and control method thereof, method for control oil return using oil level and oil flow
US-10025323-B2 · Jul 17, 2018 · US
Oil sensor for a compressor
US-2018136124-A1 · May 17, 2018 · US
Refrigerant Compressor
US-2017218944-A1 · Aug 3, 2017 · US
Oil level detecting apparatus and control method thereof, oil flow detecting apparatus and control method thereof, method for control oil return using oil level and oil flow
US-2016187173-A1 · Jun 30, 2016 · US
Compressor
US-8978826-B2 · Mar 17, 2015 · US