In-band signaling for routing
US-RE46243-E · Dec 20, 2016 · US
Arrangements for transferring received calls from one subscriber to another; Arrangements affording interim conversations between either the calling or the called party and a third party (substation line holding circuits H04M1/80)
Arrangements for transferring received calls from one subscriber to another; Arrangements affording interim conversations between either the calling or the called party and a third party (substation line holding circuits H04M1/80) · Cooperative Patent Classification (CPC)
Electric circuits, power, telecommunications, and semiconductors.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | H04M3/58 |
| Official title | Arrangements for transferring received calls from one subscriber to another; Arrangements affording interim conversations between either the calling or the called party and a third party (substation line holding circuits H04M1/80) |
| Display label | Arrangements for transferring received calls from one subscriber to another; Arrangements affording interim conversations between either the calling or the called party and a third party (substation line holding circuits H04M1/80) |
| Total patents | 429 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is stable.
| Year | Patents |
|---|---|
| 2015 | 45 |
| 2016 | 38 |
| 2017 | 58 |
| 2018 | 49 |
| 2019 | 51 |
| 2020 | 47 |
| 2021 | 26 |
| 2022 | 22 |
| 2023 | 35 |
| 2024 | 24 |
| 2025 | 29 |
| 2026 | 5 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
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Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC H04M3/58?
- CPC H04M3/58 is the Cooperative Patent Classification code for “Arrangements for transferring received calls from one subscriber to another; Arrangements affording interim conversations between either the calling or the called party and a third party (substation line holding circuits H04M1/80).”
- How many patents are filed under CPC H04M3/58 (Arrangements for transferring received calls from one subscriber to another; Arrangements affording interim conversations between either the calling or the called party and a third party (substation line holding circuits H04M1/80))?
- Our database includes 429 publications tagged with this CPC code.
- Is patent activity under CPC H04M3/58 growing?
- Publication counts under this code: 24 in 2024 vs 29 in 2025 (latest complete years).