Unique call progress tone invocation timer per client or access type
US-12581012-B2 · Mar 17, 2026 · US
Line monitoring circuits for call progress or status discrimination {(for detecting caller identity H04M1/573)}
Line monitoring circuits for call progress or status discrimination {(for detecting caller identity H04M1/573)} · Cooperative Patent Classification (CPC)
Electric circuits, power, telecommunications, and semiconductors.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | H04M1/82 |
| Official title | Line monitoring circuits for call progress or status discrimination {(for detecting caller identity H04M1/573)} |
| Display label | Line monitoring circuits for call progress or status discrimination {(for detecting caller identity H04M1/573)} |
| Total patents | 58 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 7 |
| 2016 | 3 |
| 2017 | 7 |
| 2018 | 4 |
| 2019 | 5 |
| 2020 | 2 |
| 2021 | 9 |
| 2022 | 4 |
| 2023 | 4 |
| 2024 | 6 |
| 2025 | 5 |
| 2026 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Systems for identifying the answering party of an automated voice call
US-2026046360-A1 · Feb 12, 2026 · US
Methods and apparatus for bypassing holds
US-2025385968-A1 · Dec 18, 2025 · US
Systems for identifying the answering party of an automated voice call
US-12452373-B2 · Oct 21, 2025 · US
Methods and apparatus for bypassing holds
US-12407776-B2 · Sep 2, 2025 · US
Call Forwarding Enhancements
US-2025080955-A1 · Mar 6, 2025 · US
Call Forwarding Enhancements in a Device-to-Device Environment
US-2025080956-A1 · Mar 6, 2025 · US
Methods and apparatus for bypassing holds
US-2024340373-A1 · Oct 10, 2024 · US
Representation of audio sources during a call
US-2024323281-A1 · Sep 26, 2024 · US
Systems for identifying the answering party of an automated voice call
US-2024205337-A1 · Jun 20, 2024 · US
Methods and apparatus for bypassing holds
US-12015736-B2 · Jun 18, 2024 · US
Unique call progress tone invocation timer per client or access type
US-2024114089-A1 · Apr 4, 2024 · US
Call processing method, call processing apparatus, electronic device, and medium
US-2024089368-A1 · Mar 14, 2024 · US
Systems for identifying the answering party of an automated voice call
US-11856144-B2 · Dec 26, 2023 · US
Methods and apparatus for bypassing holds
US-2023308542-A1 · Sep 28, 2023 · US
Smart notification system for voice calls
US-11706332-B2 · Jul 18, 2023 · US
Methods and apparatus for bypassing holds
US-11677871-B2 · Jun 13, 2023 · US
Methods and apparatus for bypassing holds
US-2022272191-A1 · Aug 25, 2022 · US
Gateway and method for managing VoIP telephone service
US-11363134-B2 · Jun 14, 2022 · US
Methods and apparatus for bypassing holds
US-11336767-B2 · May 17, 2022 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC H04M1/82?
- CPC H04M1/82 is the Cooperative Patent Classification code for “Line monitoring circuits for call progress or status discrimination {(for detecting caller identity H04M1/573)}.”
- How many patents are filed under CPC H04M1/82 (Line monitoring circuits for call progress or status discrimination {(for detecting caller identity H04M1/573)})?
- Our database includes 58 publications tagged with this CPC code.
- Is patent activity under CPC H04M1/82 growing?
- Publication counts under this code: 6 in 2024 vs 5 in 2025 (latest complete years).