Amplifier connected with a plurality of speakers
US-12531520-B2 · Jan 20, 2026 · US
to emulate discharge tube amplifier characteristics · Cooperative Patent Classification (CPC)
Electric circuits, power, telecommunications, and semiconductors.
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | H03F1/327 |
| Official title | {to emulate discharge tube amplifier characteristics} |
| Display label | to emulate discharge tube amplifier characteristics |
| Total patents | 14 |
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is stable.
| Year | Patents |
|---|---|
| 2015 | 2 |
| 2016 | 2 |
| 2017 | 1 |
| 2019 | 2 |
| 2020 | 2 |
| 2021 | 1 |
| 2023 | 1 |
| 2024 | 2 |
| 2026 | 1 |
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
US-12531520-B2 · Jan 20, 2026 · US
US-2024178799-A1 · May 30, 2024 · US
US-2024178802-A1 · May 30, 2024 · US
US-11670272-B2 · Jun 6, 2023 · US
US-2021201879-A1 · Jul 1, 2021 · US
US-10749484-B2 · Aug 18, 2020 · US
US-2020153392-A1 · May 14, 2020 · US
US-10218318-B2 · Feb 26, 2019 · US
US-2019028068-A1 · Jan 24, 2019 · US
US-9680432-B2 · Jun 13, 2017 · US
US-2016268986-A1 · Sep 15, 2016 · US
US-9325285-B2 · Apr 26, 2016 · US
US-9136798-B2 · Sep 15, 2015 · US
US-9124226-B2 · Sep 1, 2015 · US