Microwave circulator
US-12573736-B2 · Mar 10, 2026 · US
using non- reciprocal phase shifters (H01P1/393 takes precedence)
using non- reciprocal phase shifters (H01P1/393 takes precedence) · Cooperative Patent Classification (CPC)
Electric circuits, power, telecommunications, and semiconductors.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | H01P1/397 |
| Official title | using non- reciprocal phase shifters (H01P1/393 takes precedence) |
| Display label | using non- reciprocal phase shifters (H01P1/393 takes precedence) |
| Total patents | 37 |
Filing trend
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 | 3 |
| 2018 | 4 |
| 2020 | 8 |
| 2021 | 3 |
| 2022 | 3 |
| 2023 | 6 |
| 2024 | 1 |
| 2025 | 3 |
| 2026 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Remote compensators for mobile devices
US-12562445-B2 · Feb 24, 2026 · US
Multipole multiband isolator devices
US-12500324-B2 · Dec 16, 2025 · US
Composite filter and communication device
US-12388409-B2 · Aug 12, 2025 · US
Multipole multiband isolator devices
US-2025007141-A1 · Jan 2, 2025 · US
Remote compensators for mobile devices
US-2024030578-A1 · Jan 25, 2024 · US
Remote compensators for mobile devices
US-11855328-B2 · Dec 26, 2023 · US
Composite filter and communication device
US-2023344401-A1 · Oct 26, 2023 · US
Phase shifter assembly, cavity phase shifter with phase shifter assembly and base station antenna
US-2023253710-A1 · Aug 10, 2023 · US
Microwave circulator
US-11677129-B2 · Jun 13, 2023 · US
Low-loss quasi-circulator
US-2023112914-A1 · Apr 13, 2023 · US
Remote compensators for mobile devices
US-2023065202-A1 · Mar 2, 2023 · US
Remote compensators for mobile devices
US-11515608-B2 · Nov 29, 2022 · US
Improved microwave circulator
US-2022166120-A1 · May 26, 2022 · US
Radiofrequency and other electronic devices formed from enhanced resonant frequency hexaferrite materials
US-11245169-B2 · Feb 8, 2022 · US
Circuits and methods for circulators including a plurality of cancellation paths
US-11205826-B2 · Dec 21, 2021 · US
Circuits and methods for circulators including a plurality of cancellation paths
US-2021242552-A1 · Aug 5, 2021 · US
Radiofrequency and other electronic devices formed from enhanced resonant frequency hexaferrite materials
US-2021151843-A1 · May 20, 2021 · US
Radiofrequency and other electronic devices formed from enhanced resonant frequency hexaferrite materials
US-10862184-B2 · Dec 8, 2020 · US
Remote compensators for mobile devices
US-2020274219-A1 · Aug 27, 2020 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC H01P1/397?
- CPC H01P1/397 is the Cooperative Patent Classification code for “using non- reciprocal phase shifters (H01P1/393 takes precedence).”
- How many patents are filed under CPC H01P1/397 (using non- reciprocal phase shifters (H01P1/393 takes precedence))?
- Our database includes 37 publications tagged with this CPC code.
- Is patent activity under CPC H01P1/397 growing?
- Publication counts under this code: 1 in 2024 vs 3 in 2025 (latest complete years).