Open earphone
US-2024422466-A1 · Dec 19, 2024 · US
in which sound waves act upon both sides of a diaphragm and incorporating acoustic phase-shifting means, e.g. pressure-gradient microphone
in which sound waves act upon both sides of a diaphragm and incorporating acoustic phase-shifting means, e.g. pressure-gradient microphone · Cooperative Patent Classification (CPC)
Electric circuits, power, telecommunications, and semiconductors.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | H04R1/38 |
| Official title | in which sound waves act upon both sides of a diaphragm and incorporating acoustic phase-shifting means, e.g. pressure-gradient microphone |
| Display label | in which sound waves act upon both sides of a diaphragm and incorporating acoustic phase-shifting means, e.g. pressure-gradient microphone |
| Total patents | 254 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 12 |
| 2016 | 13 |
| 2017 | 9 |
| 2018 | 21 |
| 2019 | 15 |
| 2020 | 14 |
| 2021 | 41 |
| 2022 | 33 |
| 2023 | 47 |
| 2024 | 29 |
| 2025 | 19 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Method and apparatus for own-voice sensing in a hearing assistance device
US-2024089677-A1 · Mar 14, 2024 · US
Acoustic transducer
US-10484774-B2 · Nov 19, 2019 · US
Gradient micro-electro-mechanical systems (mems) microphone
US-2019110116-A1 · Apr 11, 2019 · US
Directional microphone device and signal processing techniques
US-10237649-B2 · Mar 19, 2019 · US
Gradient micro-electro-mechanical systems (MEMS) microphone
US-10154330-B2 · Dec 11, 2018 · US
Sound pressure gradient microphone
US-2018324522-A1 · Nov 8, 2018 · US
Electronic device including directional mems microphone assembly
US-2018279056-A1 · Sep 27, 2018 · US
Gradient micro-electro-mechanical systems (mems) microphone with varying height assemblies
US-2018249235-A1 · Aug 30, 2018 · US
Microphone having a sound delay filter
US-2018167709-A1 · Jun 14, 2018 · US
Acoustic Transducer
US-2018167710-A1 · Jun 14, 2018 · US
Method and apparatus for own-voice sensing in a hearing assistance device
US-2018160238-A1 · Jun 7, 2018 · US
MEMS sensor
US-9986319-B2 · May 29, 2018 · US
Unidirectional condenser microphone unit, unidirectional condenser microphone, and method of manufacturing unidirectional condenser microphone unit
US-9967678-B2 · May 8, 2018 · US
Directional microphone device and signal processing techniques
US-2018124510-A1 · May 3, 2018 · US
Pressure gradient microphone for measuring an acoustic characteristic of a loudspeaker
US-9961464-B2 · May 1, 2018 · US
MEMS Sensor
US-2018115810-A1 · Apr 26, 2018 · US
Gradient micro-electro-mechanical systems (MEMS) microphone with varying height assemblies
US-9955246-B2 · Apr 24, 2018 · US
Pressure gradient microphone for measuring an acoustic characteristic of a loudspeaker
US-2018091910-A1 · Mar 29, 2018 · US
Microphone and microphone apparatus
US-9924264-B2 · Mar 20, 2018 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC H04R1/38?
- CPC H04R1/38 is the Cooperative Patent Classification code for “in which sound waves act upon both sides of a diaphragm and incorporating acoustic phase-shifting means, e.g. pressure-gradient microphone.”
- How many patents are filed under CPC H04R1/38 (in which sound waves act upon both sides of a diaphragm and incorporating acoustic phase-shifting means, e.g. pressure-gradient microphone)?
- Our database includes 254 publications tagged with this CPC code.
- Is patent activity under CPC H04R1/38 growing?
- Publication counts under this code: 29 in 2024 vs 19 in 2025 (latest complete years).