Oil type phase shift transformer for medium voltage inverter system
US-10069437-B2 · Sep 4, 2018 · US
Oil cooling
Oil cooling · Cooperative Patent Classification (CPC)
Electric circuits, power, telecommunications, and semiconductors.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | H01F27/12 |
| Official title | Oil cooling |
| Display label | Oil cooling |
| Total patents | 294 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 16 |
| 2016 | 17 |
| 2017 | 26 |
| 2018 | 31 |
| 2019 | 32 |
| 2020 | 39 |
| 2021 | 30 |
| 2022 | 22 |
| 2023 | 31 |
| 2024 | 32 |
| 2025 | 14 |
| 2026 | 4 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Transformer having noise reduction structure
US-2017365401-A1 · Dec 21, 2017 · US
Electrical device with a housing holding insulation oil and a sensor and method of monitoring the device
US-2017336243-A1 · Nov 23, 2017 · US
Pulse power module
US-2017338033-A1 · Nov 23, 2017 · US
Cooling device of power transformer
US-9818525-B2 · Nov 14, 2017 · US
Transformer with insertable high voltage conductor
US-2017316862-A1 · Nov 2, 2017 · US
Replacement Transformer With Modular Construction
US-2017316864-A1 · Nov 2, 2017 · US
Transformer With Hinged Cooling Module
US-2017316861-A1 · Nov 2, 2017 · US
Isolation transformer, and X-ray generating apparatus and radiography system including the same
US-9805853-B2 · Oct 31, 2017 · US
Electrical transformer systems and methods
US-2017301449-A1 · Oct 19, 2017 · US
Oil Type Phase Shift Transformer for Medium Voltage Inverter System
US-2017288572-A1 · Oct 5, 2017 · US
Material coating system and method
US-2017274419-A1 · Sep 28, 2017 · US
Bullet-Resistant Electrical Installation
US-2017279251-A1 · Sep 28, 2017 · US
Leakage oil detector system and method
US-2017234762-A1 · Aug 17, 2017 · US
Core for an electrical induction device
US-2017213631-A1 · Jul 27, 2017 · US
Static apparatus
US-9691536-B2 · Jun 27, 2017 · US
Method and device for insulation of high-voltage generator tank
US-2017178799-A1 · Jun 22, 2017 · US
Subsea transformer with seawater high resistance ground
US-9679693-B2 · Jun 13, 2017 · US
Device comprising a high voltage apparatus including a fluid and equipment for detecting one or more physical properties of the fluid
US-9666351-B2 · May 30, 2017 · US
Oil-oil bushing and oil transformer
US-9666329-B2 · May 30, 2017 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC H01F27/12?
- CPC H01F27/12 is the Cooperative Patent Classification code for “Oil cooling.”
- How many patents are filed under CPC H01F27/12 (Oil cooling)?
- Our database includes 294 publications tagged with this CPC code.
- Is patent activity under CPC H01F27/12 growing?
- Publication counts under this code: 32 in 2024 vs 14 in 2025 (latest complete years).