Transmitting messages to a display device based on detected audio output
US-2025103277-A1 · Mar 27, 2025 · US
Electric megaphones
Electric megaphones · Cooperative Patent Classification (CPC)
Electric circuits, power, telecommunications, and semiconductors.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | H04R27/04 |
| Official title | Electric megaphones |
| Display label | Electric megaphones |
| Total patents | 34 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is growing.
| Year | Patents |
|---|---|
| 2016 | 1 |
| 2017 | 3 |
| 2019 | 2 |
| 2020 | 4 |
| 2021 | 1 |
| 2022 | 9 |
| 2023 | 3 |
| 2024 | 9 |
| 2025 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Transmitting messages to a display device based on detected audio output
US-12204818-B2 · Jan 21, 2025 · US
Cork-leather-covered loudspeaker grille
US-12108199-B2 · Oct 1, 2024 · US
Smart speaker
US-12095162-B2 · Sep 17, 2024 · US
Acoustic loudspeaker comprising a cabinet and a rotary mounted speaker
US-12041413-B2 · Jul 16, 2024 · US
Transmitting messages to a display device based on detected audio output
US-2024220192-A1 · Jul 4, 2024 · US
Cork-leather-covered loudspeaker grille
US-2024196121-A1 · Jun 13, 2024 · US
Medical apparatus and program
US-11986334-B2 · May 21, 2024 · US
Transmitting messages to a display device based on detected audio output
US-11954400-B2 · Apr 9, 2024 · US
Cork-leather-covered loudspeaker grille
US-11910140-B2 · Feb 20, 2024 · US
Smart speaker
US-2024006755-A1 · Jan 4, 2024 · US
Smart mask and smart mask system
US-11848024-B2 · Dec 19, 2023 · US
Network capable parametric speaker array with interferometer and distributed coherence system
US-2023388707-A1 · Nov 30, 2023 · US
Volume control over shared trunk lines in intercom systems
US-11722603-B2 · Aug 8, 2023 · US
Acoustic loudspeaker comprising a cabinet and a rotary mounted speaker
US-2022417654-A1 · Dec 29, 2022 · US
Volume control over shared trunk lines in intercom systems
US-2022377180-A1 · Nov 24, 2022 · US
Cork-leather-covered loudspeaker grille
US-2022369010-A1 · Nov 17, 2022 · US
Volume control over shared trunk lines in intercom systems
US-11438461-B2 · Sep 6, 2022 · US
Dynamic audio broadcasting method and audio broadcasting apparatus
US-2022255523-A1 · Aug 11, 2022 · US
Smart mask and smart mask system
US-2022238129-A1 · Jul 28, 2022 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC H04R27/04?
- CPC H04R27/04 is the Cooperative Patent Classification code for “Electric megaphones.”
- How many patents are filed under CPC H04R27/04 (Electric megaphones)?
- Our database includes 34 publications tagged with this CPC code.
- Is patent activity under CPC H04R27/04 growing?
- Publication counts under this code: 9 in 2024 vs 2 in 2025 (latest complete years).