Emitter and device comprising same
US-12586747-B2 · Mar 24, 2026 · US
Heaters
Heaters · Cooperative Patent Classification (CPC)
Electric circuits, power, telecommunications, and semiconductors.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | H01J1/22 |
| Official title | Heaters |
| Display label | Heaters |
| Total patents | 31 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is stable.
| Year | Patents |
|---|---|
| 2016 | 2 |
| 2017 | 2 |
| 2018 | 3 |
| 2019 | 1 |
| 2020 | 4 |
| 2021 | 3 |
| 2022 | 6 |
| 2023 | 2 |
| 2024 | 4 |
| 2025 | 3 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Radiotherapy device and microwave source thereof
US-2025372333-A1 · Dec 4, 2025 · US
Radiotherapy device and microwave source thereof
US-12412723-B2 · Sep 9, 2025 · US
Emitter and device comprising same
US-2025218717-A1 · Jul 3, 2025 · US
Emitter and device provided with same
US-12125663-B2 · Oct 22, 2024 · US
Radiotherapy device and microwave source thereof
US-2024297009-A1 · Sep 5, 2024 · US
Radiotherapy device and microwave source thereof
US-11984292-B2 · May 14, 2024 · US
Emitter and device provided with same
US-2024153730-A1 · May 9, 2024 · US
Radiotherapy device and microwave source thereof
US-2023154716-A1 · May 18, 2023 · US
Magnetic immersion electron gun
US-11636996-B2 · Apr 25, 2023 · US
Thermoelectric field emission electron source and electron beam application device
US-11508544-B2 · Nov 22, 2022 · US
Cathode mechanism of electron gun, electron gun, and electron beam writing apparatus
US-11430628-B1 · Aug 30, 2022 · US
Cathode mechanism of electron gun, electron gun, and electron beam writing apparatus
US-2022270842-A1 · Aug 25, 2022 · US
Magnetic immersion electron gun
US-2022076914-A1 · Mar 10, 2022 · US
Cleaning device
US-11244806-B2 · Feb 8, 2022 · US
Thermoelectric field emission electron source and electron beam application device
US-2022037107-A1 · Feb 3, 2022 · US
Emitter structures for enhanced thermionic emission
US-11094493-B2 · Aug 17, 2021 · US
Cleaning Device
US-2021043414-A1 · Feb 11, 2021 · US
Emitter Structures for Enhanced Thermionic Emission
US-2021035765-A1 · Feb 4, 2021 · US
Multi-apertured conduction heater
US-10741351-B1 · Aug 11, 2020 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC H01J1/22?
- CPC H01J1/22 is the Cooperative Patent Classification code for “Heaters.”
- How many patents are filed under CPC H01J1/22 (Heaters)?
- Our database includes 31 publications tagged with this CPC code.
- Is patent activity under CPC H01J1/22 growing?
- Publication counts under this code: 4 in 2024 vs 3 in 2025 (latest complete years).