System, method, and apparatus for detecting call interception
US-2024422545-A1 · Dec 19, 2024 · US
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using multi-frequency signalling (H04Q1/46 takes precedence)
using multi-frequency signalling (H04Q1/46 takes precedence) · Cooperative Patent Classification (CPC)
Electric circuits, power, telecommunications, and semiconductors.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | H04Q1/45 |
| Official title | using multi-frequency signalling (H04Q1/46 takes precedence) |
| Display label | using multi-frequency signalling (H04Q1/46 takes precedence) |
| Total patents | 24 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is stable.
| Year | Patents |
|---|---|
| 2015 | 5 |
| 2016 | 2 |
| 2017 | 1 |
| 2018 | 4 |
| 2019 | 3 |
| 2020 | 2 |
| 2021 | 2 |
| 2022 | 2 |
| 2024 | 3 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Call classification through analysis of dtmf events
US-2024323270-A1 · Sep 26, 2024 · US
Call classification through analysis of DTMF events
US-12015731-B2 · Jun 18, 2024 · US
Call classification through analysis of dtmf events
US-2022337924-A1 · Oct 20, 2022 · US
Call classification through analysis of DTMF events
US-11388490-B2 · Jul 12, 2022 · US
Call classification through analysis of dtmf events
US-2021152897-A1 · May 20, 2021 · US
Call classification through analysis of DTMF events
US-10904643-B2 · Jan 26, 2021 · US
Elevator system
US-10807831-B2 · Oct 20, 2020 · US
Elevator system
US-2020299100-A1 · Sep 24, 2020 · US
Call classification through analysis of dtmf events
US-2019238956-A1 · Aug 1, 2019 · US
Chord modulation communication system
US-10312933-B1 · Jun 4, 2019 · US
Call classification through analysis of DTMF events
US-10257591-B2 · Apr 9, 2019 · US
Telephone switching apparatus and method, and program
US-10165098-B2 · Dec 25, 2018 · US
Detection and identification of synchronizing signals embedded in voice or data
US-10148389-B1 · Dec 4, 2018 · US
Telephone switching apparatus and method, and program
US-2018131795-A1 · May 10, 2018 · US
Call classification through analysis of dtmf events
US-2018041823-A1 · Feb 8, 2018 · US
Method of Inter-Frequency or Inter-Radio Access Technology Measurement
US-2017359632-A1 · Dec 14, 2017 · US
Voice-operated interface for DTMF-controlled systems
US-9485347-B2 · Nov 1, 2016 · US
Voice-operated interface for dtmf-controlled systems
US-2016088142-A1 · Mar 24, 2016 · US
Voice-operated interface for DTMF-controlled systems
US-9215305-B2 · Dec 15, 2015 · US