Acoustic device
US-2017353796-A1 · Dec 7, 2017 · US
Arrangements for obtaining desired frequency or directional characteristics (for stereophonic purpose H04R5/00)
Arrangements for obtaining desired frequency or directional characteristics (for stereophonic purpose H04R5/00) · Cooperative Patent Classification (CPC)
Electric circuits, power, telecommunications, and semiconductors.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | H04R1/20 |
| Official title | Arrangements for obtaining desired frequency or directional characteristics (for stereophonic purpose H04R5/00) |
| Display label | Arrangements for obtaining desired frequency or directional characteristics (for stereophonic purpose H04R5/00) |
| Total patents | 509 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 23 |
| 2016 | 23 |
| 2017 | 30 |
| 2018 | 37 |
| 2019 | 50 |
| 2020 | 58 |
| 2021 | 72 |
| 2022 | 57 |
| 2023 | 61 |
| 2024 | 50 |
| 2025 | 35 |
| 2026 | 13 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Acoustic device
US-9838787-B1 · Dec 5, 2017 · US
Audio layer in keyboard device providing enhanced audio performance
US-2017332164-A1 · Nov 16, 2017 · US
Signal processing device
US-2017330541-A1 · Nov 16, 2017 · US
Resonance damping for audio transducer systems
US-9813802-B2 · Nov 7, 2017 · US
Sound system
US-9736573-B2 · Aug 15, 2017 · US
Audio layer in keyboard device providing enhanced audio performance
US-9729960-B1 · Aug 8, 2017 · US
Digital MEMS loudspeaker
US-9686610-B2 · Jun 20, 2017 · US
Bone-conduction anvil and diaphragm
US-9609412-B2 · Mar 28, 2017 · US
Playback based on received sound waves
US-2017078796-A1 · Mar 16, 2017 · US
Sound system
US-2017064439-A1 · Mar 2, 2017 · US
Digital mems loudspeaker
US-2017064450-A1 · Mar 2, 2017 · US
Sound pickup apparatus and method for picking up sound
US-9549255-B2 · Jan 17, 2017 · US
Acoustically transparent waveguide
US-9538282-B2 · Jan 3, 2017 · US
Playback based on received sound waves
US-9525931-B2 · Dec 20, 2016 · US
Sound pickup apparatus and method for picking up sound
US-2016353203-A1 · Dec 1, 2016 · US
Earphone having an acoustic tuning mechanism
US-9510086-B2 · Nov 29, 2016 · US
Audio processing device and method, and program therefor
US-2016337777-A1 · Nov 17, 2016 · US
Microphone manufacturing method, microphone, and control method
US-9485571-B2 · Nov 1, 2016 · US
Audio signal correction and calibration for a room environment
US-2016316295-A1 · Oct 27, 2016 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC H04R1/20?
- CPC H04R1/20 is the Cooperative Patent Classification code for “Arrangements for obtaining desired frequency or directional characteristics (for stereophonic purpose H04R5/00).”
- How many patents are filed under CPC H04R1/20 (Arrangements for obtaining desired frequency or directional characteristics (for stereophonic purpose H04R5/00))?
- Our database includes 509 publications tagged with this CPC code.
- Is patent activity under CPC H04R1/20 growing?
- Publication counts under this code: 50 in 2024 vs 35 in 2025 (latest complete years).