Method and system for volume control
US-12481476-B2 · Nov 25, 2025 · US
Applications of speech amplifiers
Applications of speech amplifiers · Cooperative Patent Classification (CPC)
Electric circuits, power, telecommunications, and semiconductors.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | H04M3/40 |
| Official title | Applications of speech amplifiers |
| Display label | Applications of speech amplifiers |
| Total patents | 30 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 2 |
| 2018 | 1 |
| 2019 | 2 |
| 2020 | 4 |
| 2021 | 4 |
| 2022 | 8 |
| 2023 | 4 |
| 2024 | 3 |
| 2025 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Conversational service
US-12243546-B2 · Mar 4, 2025 · US
Data processing method and apparatus
US-2024364757-A1 · Oct 31, 2024 · US
Voice filtering other speakers from calls and audio messages
US-12087297-B2 · Sep 10, 2024 · US
Acoustic feedback management in real-time audio communication
US-2024040043-A1 · Feb 1, 2024 · US
Call system, terminal apparatus, and operating method of call system
US-2023247127-A1 · Aug 3, 2023 · US
Conversational Service
US-2023178090-A1 · Jun 8, 2023 · US
Method and system for volume control
US-2023008865-A1 · Jan 12, 2023 · US
Voice Filtering Other Speakers From Calls And Audio Messages
US-2023005480-A1 · Jan 5, 2023 · US
Voice filtering other speakers from calls and audio messages
US-11462219-B2 · Oct 4, 2022 · US
System and method for content focused conversation
US-2022293122-A1 · Sep 15, 2022 · US
Communication device audio transmission modification
US-11340865-B2 · May 24, 2022 · US
Communication device audio transmission modification
US-11340864-B2 · May 24, 2022 · US
Voice Filtering Other Speakers From Calls And Audio Messages
US-2022139388-A1 · May 5, 2022 · US
Techniques for using computer vision to alter operation of speaker(s) and/or microphone(s) of device
US-11258417-B2 · Feb 22, 2022 · US
Communication device audio transmission modification
US-2022050657-A1 · Feb 17, 2022 · US
Communication device audio transmission modification
US-2022050658-A1 · Feb 17, 2022 · US
Programmable mixing on a multi-interface telecommunication device
US-2021373842-A1 · Dec 2, 2021 · US
Systems and methods for in-vehicle voice calls
US-10999419-B1 · May 4, 2021 · US
Techniques for using computer vision to alter operation of speaker(s) and/or microphone(s) of device
US-2021099146-A1 · Apr 1, 2021 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC H04M3/40?
- CPC H04M3/40 is the Cooperative Patent Classification code for “Applications of speech amplifiers.”
- How many patents are filed under CPC H04M3/40 (Applications of speech amplifiers)?
- Our database includes 30 publications tagged with this CPC code.
- Is patent activity under CPC H04M3/40 growing?
- Publication counts under this code: 3 in 2024 vs 2 in 2025 (latest complete years).