Dielectric fluid for transformer retrofilling
US-2022415535-A1 · Dec 29, 2022 · US
using a fluid for insulating purposes only
using a fluid for insulating purposes only · Cooperative Patent Classification (CPC)
Electric circuits, power, telecommunications, and semiconductors.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | H01F27/321 |
| Official title | {using a fluid for insulating purposes only} |
| Display label | using a fluid for insulating purposes only |
| Total patents | 98 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 2 |
| 2016 | 3 |
| 2017 | 8 |
| 2018 | 6 |
| 2019 | 18 |
| 2020 | 8 |
| 2021 | 9 |
| 2022 | 7 |
| 2023 | 14 |
| 2024 | 11 |
| 2025 | 5 |
| 2026 | 7 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Dry High Voltage Instrument Transformer
US-2022384094-A1 · Dec 1, 2022 · US
Transformer assembly with medium frequency transformers
US-11480602-B2 · Oct 25, 2022 · US
Instrument transformer and method to isolate parts
US-2022319770-A1 · Oct 6, 2022 · US
Method for measuring a quantity of liquid in a liquid-insulated electrical component, liquid-insulated electrical component and railroad vehicle having the same
US-2022254564-A1 · Aug 11, 2022 · US
Dielectric fluid comprising fatty acid esters
US-11232884-B2 · Jan 25, 2022 · US
Use of 1-chloro-2,3,3,3-tetrafluoropropene for isolating or extinguishing electric arcs
US-11133139-B2 · Sep 28, 2021 · US
Transformer arrangement and method for controlling pressure in a liquid-filled transformer
US-11114234-B2 · Sep 7, 2021 · US
Inductor
US-2021217552-A1 · Jul 15, 2021 · US
Measuring method and high-voltage transducer with clean air
US-2021175007-A1 · Jun 10, 2021 · US
Temperature estimation method
US-11015987-B2 · May 25, 2021 · US
Electric device with pressing plates for clamping a magnetizable core
US-2021050139-A1 · Feb 18, 2021 · US
Tank for liquid-filled shell transformers or shell reactors
US-2021043370-A1 · Feb 11, 2021 · US
Gas-insulated electrical apparatus, in particular gas-insulated transformer or reactor
US-10910138-B2 · Feb 2, 2021 · US
Transformer Assembly With Medium Frequency Transformers
US-2021018554-A1 · Jan 21, 2021 · US
Use of 1-chloro-2,3,3,3-tetrafluoropropene for isolating or extinguishing electric arcs
US-2020365353-A1 · Nov 19, 2020 · US
Method of Diagnosing Oil-Immersed Electrical Apparatus
US-2020326364-A1 · Oct 15, 2020 · US
Igniter assembly with improved insulation and method of insulating the igniter assembly
US-10774805-B2 · Sep 15, 2020 · US
Dielectric fluid comprising fatty acid esters
US-2020279670-A1 · Sep 3, 2020 · US
Three-phase reactor
US-10741319-B2 · Aug 11, 2020 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC H01F27/321?
- CPC H01F27/321 is the Cooperative Patent Classification code for “using a fluid for insulating purposes only.”
- How many patents are filed under CPC H01F27/321 (using a fluid for insulating purposes only)?
- Our database includes 98 publications tagged with this CPC code.
- Is patent activity under CPC H01F27/321 growing?
- Publication counts under this code: 11 in 2024 vs 5 in 2025 (latest complete years).