Air motion transformer transducer with closed-circuit magnet motor system
US-12464295-B2 · Nov 4, 2025 · US
of the ribbon type
of the ribbon type · Cooperative Patent Classification (CPC)
Electric circuits, power, telecommunications, and semiconductors.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | H04R9/048 |
| Official title | {of the ribbon type} |
| Display label | of the ribbon type |
| Total patents | 26 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is rapidly declining.
| Year | Patents |
|---|---|
| 2015 | 2 |
| 2016 | 2 |
| 2017 | 5 |
| 2018 | 3 |
| 2019 | 2 |
| 2020 | 4 |
| 2021 | 3 |
| 2022 | 2 |
| 2024 | 2 |
| 2025 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Air Motion Transformer Transducer with Closed-Circuit Magnet Motor System
US-2024292157-A1 · Aug 29, 2024 · US
Directional ribbon microphone assembly
US-11917381-B2 · Feb 27, 2024 · US
Fiber microphone
US-11490208-B2 · Nov 1, 2022 · US
Directional Ribbon Microphone Assembly
US-2022272452-A1 · Aug 25, 2022 · US
Fiber microphone
US-2021281952-A1 · Sep 9, 2021 · US
Fiber microphone
US-11006219-B2 · May 11, 2021 · US
Stethoscope with extended detection range
US-10888300-B2 · Jan 12, 2021 · US
Stethoscope with extended detection range
US-2020170611-A1 · Jun 4, 2020 · US
Fiber microphone
US-2020162821-A1 · May 21, 2020 · US
Planar loudspeaker manifold for improved sound dispersion
US-10602263-B2 · Mar 24, 2020 · US
Stethoscope with extended detection range
US-10548562-B2 · Feb 4, 2020 · US
Method of forming an acoustic transducer
US-10390162-B2 · Aug 20, 2019 · US
Planar loudspeaker manifold for improved sound dispersion
US-2019052956-A1 · Feb 14, 2019 · US
Speaker device and microphone device
US-10149059-B2 · Dec 4, 2018 · US
Unidirectional microphone
US-9980039-B2 · May 22, 2018 · US
Speaker device and microphone device
US-2018077496-A1 · Mar 15, 2018 · US
Microphone
US-2017195764-A1 · Jul 6, 2017 · US
Unidirectional microphone
US-2017195782-A1 · Jul 6, 2017 · US
Sound transducer with interdigitated first and second sets of comb fingers
US-9674627-B2 · Jun 6, 2017 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC H04R9/048?
- CPC H04R9/048 is the Cooperative Patent Classification code for “of the ribbon type.”
- How many patents are filed under CPC H04R9/048 (of the ribbon type)?
- Our database includes 26 publications tagged with this CPC code.
- Is patent activity under CPC H04R9/048 growing?
- Publication counts under this code: 2 in 2024 vs 1 in 2025 (latest complete years).