Electronic device comprising plurality of displays, and control method thereof
US-2025306742-A1 · Oct 2, 2025 · US
Circuit arrangements for preventing eavesdropping
Circuit arrangements for preventing eavesdropping · Cooperative Patent Classification (CPC)
Electric circuits, power, telecommunications, and semiconductors.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | H04M1/68 |
| Official title | Circuit arrangements for preventing eavesdropping |
| Display label | Circuit arrangements for preventing eavesdropping |
| Total patents | 55 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 8 |
| 2016 | 6 |
| 2017 | 6 |
| 2018 | 4 |
| 2019 | 3 |
| 2020 | 3 |
| 2021 | 8 |
| 2022 | 5 |
| 2023 | 2 |
| 2024 | 5 |
| 2025 | 5 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Systems and methods for detecting call provenance from call audio
US-2025260764-A1 · Aug 14, 2025 · US
Systems and methods for detecting call provenance from call audio
US-12355914-B2 · Jul 8, 2025 · US
Systems and methods for detecting call provenance from call audio
US-12323553-B2 · Jun 3, 2025 · US
Method and system for restricting forwarding of voice data on smart phone devices
US-2025053372-A1 · Feb 13, 2025 · US
Systems and methods for detecting call provenance from call audio
US-2024223697-A1 · Jul 4, 2024 · US
Mobile terminal for preventing sound leakage and sound output method for mobile terminal
US-2024223689-A1 · Jul 4, 2024 · US
Systems and methods for detecting call provenance from call audio
US-2024137439-A1 · Apr 25, 2024 · US
Sound processing logic connections
US-11928385-B2 · Mar 12, 2024 · US
System and method to prevent unauthorized voice detection via fiber links
US-11901960-B2 · Feb 13, 2024 · US
Systems and methods for detecting call provenance from call audio
US-11849065-B2 · Dec 19, 2023 · US
Inter-channel level difference based acoustic tap detection
US-11785406-B2 · Oct 10, 2023 · US
Anti-eavesdrop security device
US-11488571-B2 · Nov 1, 2022 · US
System and method to prevent unauthorized voice detection via fiber links
US-2022263587-A1 · Aug 18, 2022 · US
System and method to prevent unauthorized voice detection via fiber links
US-11349577-B2 · May 31, 2022 · US
Sound processing logic connections
US-2022147308-A1 · May 12, 2022 · US
Anti-eavesdrop security device
US-2022005449-A1 · Jan 6, 2022 · US
System and method to prevent unauthorized voice detection via fiber links
US-2021367680-A1 · Nov 25, 2021 · US
Systems and methods for detecting call provenance from call audio
US-2021295861-A1 · Sep 23, 2021 · US
Telecommunication device, telecommunication system, method for operating a telecommunication device, and computer program
US-11122157-B2 · Sep 14, 2021 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC H04M1/68?
- CPC H04M1/68 is the Cooperative Patent Classification code for “Circuit arrangements for preventing eavesdropping.”
- How many patents are filed under CPC H04M1/68 (Circuit arrangements for preventing eavesdropping)?
- Our database includes 55 publications tagged with this CPC code.
- Is patent activity under CPC H04M1/68 growing?
- Publication counts under this code: 5 in 2024 vs 5 in 2025 (latest complete years).