Slip ring system and electrical machine having a slip ring system of this kind
US-10840774-B2 · Nov 17, 2020 · US
Brush holders
Brush holders · Cooperative Patent Classification (CPC)
Electric circuits, power, telecommunications, and semiconductors.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | H01R39/38 |
| Official title | Brush holders |
| Display label | Brush holders |
| Total patents | 120 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is growing.
| Year | Patents |
|---|---|
| 2015 | 9 |
| 2016 | 18 |
| 2017 | 8 |
| 2018 | 7 |
| 2019 | 14 |
| 2020 | 6 |
| 2021 | 12 |
| 2022 | 13 |
| 2023 | 4 |
| 2024 | 13 |
| 2025 | 15 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Brush assembly
US-2020182226-A1 · Jun 11, 2020 · US
System and method for monitoring the status of one or more components of an electrical machine
US-2020112133-A1 · Apr 9, 2020 · US
Drive Device, Hydraulic Pump, Motor Vehicle
US-2020106326-A1 · Apr 2, 2020 · US
Brush arrangement
US-2019368471-A1 · Dec 5, 2019 · US
Motor
US-2019363499-A1 · Nov 28, 2019 · US
Rotary electrical machine with improved power electronics
US-10491079-B2 · Nov 26, 2019 · US
Brush holder assembly for an electric motor
US-10411565-B2 · Sep 10, 2019 · US
Electric motor
US-10404129-B2 · Sep 3, 2019 · US
Brush wear and vibration monitoring
US-10348047-B2 · Jul 9, 2019 · US
Brush wear and vibration monitoring
US-2019207353-A1 · Jul 4, 2019 · US
Slip Ring System and Electrical Machine Having a Slip Ring System of This Kind
US-2019140521-A1 · May 9, 2019 · US
Method and test tool for adjusting brush holders in slip ring systems
US-10236741-B2 · Mar 19, 2019 · US
Brush holder apparatus, brush assembly, and method
US-10199790-B2 · Feb 5, 2019 · US
Diaphragm Pump and Motor System and Method
US-2019036287-A1 · Jan 31, 2019 · US
Driving device and window lift actuator using the same
US-2019036427-A1 · Jan 31, 2019 · US
Motor, end cap and manufacturing method thereof
US-2019020240-A1 · Jan 17, 2019 · US
Motor
US-2019013719-A1 · Jan 10, 2019 · US
Brush holder apparatus and brush spring having friction enhancing material
US-10158206-B2 · Dec 18, 2018 · US
Brush holder apparatus and brush spring having friction enhancing material
US-2018301860-A1 · Oct 18, 2018 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC H01R39/38?
- CPC H01R39/38 is the Cooperative Patent Classification code for “Brush holders.”
- How many patents are filed under CPC H01R39/38 (Brush holders)?
- Our database includes 120 publications tagged with this CPC code.
- Is patent activity under CPC H01R39/38 growing?
- Publication counts under this code: 13 in 2024 vs 15 in 2025 (latest complete years).