Mixed-gas species plasma source system
US-2025210303-A1 · Jun 26, 2025 · US
Ion guns
Ion guns · Cooperative Patent Classification (CPC)
Electric circuits, power, telecommunications, and semiconductors.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | H01J3/04 |
| Official title | Ion guns |
| Display label | Ion guns |
| Total patents | 35 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is rapidly declining.
| Year | Patents |
|---|---|
| 2015 | 8 |
| 2016 | 9 |
| 2017 | 5 |
| 2018 | 3 |
| 2019 | 4 |
| 2020 | 3 |
| 2022 | 1 |
| 2024 | 1 |
| 2025 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Filament alignment device
US-2024153740-A1 · May 9, 2024 · US
Self-aligned electrospray device and related manufacturing techniques
US-11217417-B2 · Jan 4, 2022 · US
Self-aligned electrospray device and related manufacturing techniques
US-2020395186-A1 · Dec 17, 2020 · US
Methods and assemblies using fluorine containing and inert gases for plasma flood gun operation
US-10622192-B2 · Apr 14, 2020 · US
Ion trajectory manipulation architecture in an ion pump
US-10550829-B2 · Feb 4, 2020 · US
Marking paper products
US-2019311161-A1 · Oct 10, 2019 · US
Marking paper products
US-10380388-B2 · Aug 13, 2019 · US
Methods and assemblies using flourine containing and inert gasses for plasma flood gun (pfg) operation
US-2019189402-A1 · Jun 20, 2019 · US
Semiconductor micro-hollow cathode discharge device for plasma jet generation
US-10271415-B2 · Apr 23, 2019 · US
Marking paper products
US-2018336375-A1 · Nov 22, 2018 · US
Source housing assembly for controlling ion beam extraction stability and ion beam current
US-9934928-B2 · Apr 3, 2018 · US
Ion trajectory manipulation architecture in an ion pump
US-2018068836-A1 · Mar 8, 2018 · US
Pyrolyzed porous carbon materials and ion emitters
US-9837237-B2 · Dec 5, 2017 · US
Semiconductor micro-hollow cathode discharge device for plasma jet generation
US-2017318654-A1 · Nov 2, 2017 · US
Pyrolyzed porous carbon materials and ion emitters
US-2017263408-A1 · Sep 14, 2017 · US
Pyrolyzed porous carbon materials and ion emitters
US-9704685-B2 · Jul 11, 2017 · US
Emitter structure, gas ion source and focused ion beam system
US-9640361-B2 · May 2, 2017 · US
Pyrolyzed porous carbon materials and ion emitters
US-2016365216-A1 · Dec 15, 2016 · US
Cam actuated filament clamp
US-9502207-B1 · Nov 22, 2016 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC H01J3/04?
- CPC H01J3/04 is the Cooperative Patent Classification code for “Ion guns.”
- How many patents are filed under CPC H01J3/04 (Ion guns)?
- Our database includes 35 publications tagged with this CPC code.
- Is patent activity under CPC H01J3/04 growing?
- Publication counts under this code: 1 in 2024 vs 1 in 2025 (latest complete years).