Methods and apparatus for bypassing holds
US-2024340373-A1 · Oct 10, 2024 · US
Subscriber line supervision circuits, e.g. call detection circuits
Subscriber line supervision circuits, e.g. call detection circuits · Cooperative Patent Classification (CPC)
Electric circuits, power, telecommunications, and semiconductors.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | H04M3/2272 |
| Official title | {Subscriber line supervision circuits, e.g. call detection circuits} |
| Display label | Subscriber line supervision circuits, e.g. call detection circuits |
| Total patents | 93 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is stable.
| Year | Patents |
|---|---|
| 2015 | 9 |
| 2016 | 9 |
| 2017 | 7 |
| 2018 | 9 |
| 2019 | 10 |
| 2020 | 3 |
| 2021 | 9 |
| 2022 | 5 |
| 2023 | 12 |
| 2024 | 11 |
| 2025 | 8 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Methods and apparatus for bypassing holds
US-2022272191-A1 · Aug 25, 2022 · US
Method for preventing sip device from being attacked, calling device, and called device
US-11399092-B2 · Jul 26, 2022 · US
AC/DC phone line detector
US-11265417-B1 · Mar 1, 2022 · US
Device, system and method for scanning communication systems of different types
US-2021385329-A1 · Dec 9, 2021 · US
Device, system and method for scanning communication systems of different types
US-11178279-B1 · Nov 16, 2021 · US
Method for preventing sip device from being attacked, calling device, and called device
US-2021352174-A1 · Nov 11, 2021 · US
Dynamic controlled-environment facility resident communication allocation based on call volume
US-11095770-B1 · Aug 17, 2021 · US
Adjustable sip mute call and one-way communication detection and reporting systems and methods
US-2021243574-A1 · Aug 5, 2021 · US
Adjustable sip mute call and one-way communication detection and reporting systems and methods
US-11019467-B2 · May 25, 2021 · US
Methods and apparatus for bypassing holds
US-2021099575-A1 · Apr 1, 2021 · US
Communication volume level change detection
US-10924608-B1 · Feb 16, 2021 · US
Methods and apparatus for bypassing holds
US-10897535-B2 · Jan 19, 2021 · US
Methods and apparatus for bypassing holds
US-2020344351-A1 · Oct 29, 2020 · US
Adjustable sip mute call and one-way communication detection and reporting systems and methods
US-2020296554-A1 · Sep 17, 2020 · US
Reduction in network congestion
US-10694025-B1 · Jun 23, 2020 · US
Automatic dialer call pacing in a contact center
US-10469661-B1 · Nov 5, 2019 · US
Dynamic controlled-environment facility resident communication allocation based on call volume
US-10440175-B1 · Oct 8, 2019 · US
Communication apparatus, method of controlling communication apparatus, and storage medium
US-10440210-B2 · Oct 8, 2019 · US
Controlled communication between residents of controlled-environment facilities
US-10425529-B1 · Sep 24, 2019 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC H04M3/2272?
- CPC H04M3/2272 is the Cooperative Patent Classification code for “Subscriber line supervision circuits, e.g. call detection circuits.”
- How many patents are filed under CPC H04M3/2272 (Subscriber line supervision circuits, e.g. call detection circuits)?
- Our database includes 93 publications tagged with this CPC code.
- Is patent activity under CPC H04M3/2272 growing?
- Publication counts under this code: 11 in 2024 vs 8 in 2025 (latest complete years).