In-home event intercom and notifications
US-2025356750-A1 · Nov 20, 2025 · US
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Two-way communication systems between a limited number of parties
Two-way communication systems between a limited number of parties · Cooperative Patent Classification (CPC)
Electric circuits, power, telecommunications, and semiconductors.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | H04M9/001 |
| Official title | {Two-way communication systems between a limited number of parties} |
| Display label | Two-way communication systems between a limited number of parties |
| Total patents | 24 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is rapidly growing.
| Year | Patents |
|---|---|
| 2015 | 1 |
| 2016 | 1 |
| 2017 | 1 |
| 2018 | 1 |
| 2019 | 5 |
| 2020 | 1 |
| 2021 | 2 |
| 2022 | 5 |
| 2023 | 3 |
| 2025 | 4 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Audio device and control method thereof
US-12438989-B2 · Oct 7, 2025 · US
In-home event intercom and notifications
US-12406562-B2 · Sep 2, 2025 · US
Audio device and control method thereof
US-2025080658-A1 · Mar 6, 2025 · US
In-home event intercom and notifications
US-2023360507-A1 · Nov 9, 2023 · US
Volume control over shared trunk lines in intercom systems
US-11722603-B2 · Aug 8, 2023 · US
Message recording system for broadcast intercoms
US-11582335-B2 · Feb 14, 2023 · US
Volume control over shared trunk lines in intercom systems
US-2022377180-A1 · Nov 24, 2022 · US
Volume control over shared trunk lines in intercom systems
US-11438461-B2 · Sep 6, 2022 · US
Portable keypanel for intercom system
US-11412083-B2 · Aug 9, 2022 · US
Inter-occupant conversation device and inter-occupant conversation method
US-11328720-B2 · May 10, 2022 · US
Volume control over shared trunk lines in intercom systems
US-2022124202-A1 · Apr 21, 2022 · US
Inter-occupant conversation device and inter-occupant conversation method
US-2021201903-A1 · Jul 1, 2021 · US
Portable keypanel for intercom system
US-2021029237-A1 · Jan 28, 2021 · US
Sound dampening and pass through filtering
US-10770089-B2 · Sep 8, 2020 · US
Sound Dampening And Pass Through Filtering
US-2019348057-A1 · Nov 14, 2019 · US
Target operation device communicating system, mobile terminal, and target operation device communication cooperating method
US-10270548-B2 · Apr 23, 2019 · US
Vehicle control device and vehicle control method thereof
US-10214145-B2 · Feb 26, 2019 · US
Message Recording System for Broadcast Intercoms
US-2019052743-A1 · Feb 14, 2019 · US
Target operation device communicating system, mobile terminal, and target operation device communication cooperating method
US-2019007149-A1 · Jan 3, 2019 · US