Drive exciter and electronic device
US-2025357836-A1 · Nov 20, 2025 · US
Resonant transducers, i.e. adapted to produce maximum output at a predetermined frequency
Resonant transducers, i.e. adapted to produce maximum output at a predetermined frequency · Cooperative Patent Classification (CPC)
Electric circuits, power, telecommunications, and semiconductors.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | H04R9/18 |
| Official title | Resonant transducers, i.e. adapted to produce maximum output at a predetermined frequency |
| Display label | Resonant transducers, i.e. adapted to produce maximum output at a predetermined frequency |
| Total patents | 62 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 6 |
| 2016 | 5 |
| 2017 | 8 |
| 2018 | 3 |
| 2019 | 6 |
| 2020 | 7 |
| 2021 | 5 |
| 2022 | 7 |
| 2023 | 4 |
| 2024 | 7 |
| 2025 | 3 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Drive Exciter and Electronic Device
US-2025337307-A1 · Oct 30, 2025 · US
Hearing aid device
US-12167203-B2 · Dec 10, 2024 · US
Dual actuator bone conduction hearing prosthesis
US-2024244384-A1 · Jul 18, 2024 · US
Magnetic potential transducer and electronic apparatus using same
US-12010500-B2 · Jun 11, 2024 · US
Multifunctional sounding device
US-11968515-B2 · Apr 23, 2024 · US
Speaker and terminal device
US-11930345-B2 · Mar 12, 2024 · US
Speaker and terminal device
US-11924620-B2 · Mar 5, 2024 · US
Hearing aid device
US-2024073633-A1 · Feb 29, 2024 · US
Hearing aid device
US-11849285-B2 · Dec 19, 2023 · US
Vibration sensors
US-2023384147-A1 · Nov 30, 2023 · US
Vibrating actuator with two resonant frequencies and two moving parts
US-11784548-B2 · Oct 10, 2023 · US
Multifunctional sounding device
US-2023319483-A1 · Oct 5, 2023 · US
Hearing aid device
US-2022417682-A1 · Dec 29, 2022 · US
Method and electronic circuit for improving a driving force function of an electrodynamic acoustic transducer
US-11526645-B2 · Dec 13, 2022 · US
Hearing aid device
US-11463826-B2 · Oct 4, 2022 · US
Magnetic potential transducer and electronic apparatus using same
US-2022232327-A1 · Jul 21, 2022 · US
Sound generator
US-11317218-B2 · Apr 26, 2022 · US
Speaker and terminal device
US-2022078558-A1 · Mar 10, 2022 · US
Speaker and terminal device
US-2022078559-A1 · Mar 10, 2022 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC H04R9/18?
- CPC H04R9/18 is the Cooperative Patent Classification code for “Resonant transducers, i.e. adapted to produce maximum output at a predetermined frequency.”
- How many patents are filed under CPC H04R9/18 (Resonant transducers, i.e. adapted to produce maximum output at a predetermined frequency)?
- Our database includes 62 publications tagged with this CPC code.
- Is patent activity under CPC H04R9/18 growing?
- Publication counts under this code: 7 in 2024 vs 3 in 2025 (latest complete years).