Open earphone
US-2024422466-A1 · Dec 19, 2024 · US
Special adaptations for subaqueous use, e.g. for hydrophone
Special adaptations for subaqueous use, e.g. for hydrophone · Cooperative Patent Classification (CPC)
Electric circuits, power, telecommunications, and semiconductors.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | H04R1/44 |
| Official title | Special adaptations for subaqueous use, e.g. for hydrophone |
| Display label | Special adaptations for subaqueous use, e.g. for hydrophone |
| Total patents | 540 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 19 |
| 2016 | 24 |
| 2017 | 51 |
| 2018 | 44 |
| 2019 | 45 |
| 2020 | 48 |
| 2021 | 69 |
| 2022 | 61 |
| 2023 | 73 |
| 2024 | 55 |
| 2025 | 42 |
| 2026 | 9 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Connector assembly
US-9843127-B2 · Dec 12, 2017 · US
Underwater acoustic carbon nanotube thermophone
US-9838802-B1 · Dec 5, 2017 · US
PBLG based planar microphones
US-9838800-B2 · Dec 5, 2017 · US
Generating an audio signal from multiple microphones based on uncorrelated noise detection
US-9807530-B1 · Oct 31, 2017 · US
Drainage channel for sports camera
US-9787884-B2 · Oct 10, 2017 · US
Hydrophobic and oleophobic membrane, and waterproof sound device using same
US-2017280236-A1 · Sep 28, 2017 · US
Automatically determining a wet microphone condition in a sports camera
US-9769364-B2 · Sep 19, 2017 · US
Sound-permeable membrane, sound-permeable membrane member including same, microphone, and electronic device
US-2017245036-A1 · Aug 24, 2017 · US
Waterproof electronic device with pressure-equilibrium functions
US-2017180850-A1 · Jun 22, 2017 · US
Pressure-sensitive sensor
US-9645032-B2 · May 9, 2017 · US
Waterproof electronic device
US-9639123-B2 · May 2, 2017 · US
Magnetically controllable transducer backing component
US-9602915-B1 · Mar 21, 2017 · US
Liquid impermeable sealed speaker design
US-2017078775-A1 · Mar 16, 2017 · US
Hydraulic microphone
US-9591413-B2 · Mar 7, 2017 · US
Passive vibration cancellation system for microphone assembly
US-9591416-B2 · Mar 7, 2017 · US
Method for producing waterproof sound-permeable membrane, waterproof sound-permeable membrane, and electronic device
US-2017006365-A1 · Jan 5, 2017 · US
Liquid-resistant acoustic device gasket and membrane assemblies
US-2016378142-A1 · Dec 29, 2016 · US
Enclosure for electronic device
US-2016360627-A1 · Dec 8, 2016 · US
System and method for enhancing speech of a diver wearing a mouthpiece
US-2016351205-A1 · Dec 1, 2016 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC H04R1/44?
- CPC H04R1/44 is the Cooperative Patent Classification code for “Special adaptations for subaqueous use, e.g. for hydrophone.”
- How many patents are filed under CPC H04R1/44 (Special adaptations for subaqueous use, e.g. for hydrophone)?
- Our database includes 540 publications tagged with this CPC code.
- Is patent activity under CPC H04R1/44 growing?
- Publication counts under this code: 55 in 2024 vs 42 in 2025 (latest complete years).