Hollow cathode system for generating a plasma and method for operating such a hollow cathode system
US-12580161-B2 · Mar 17, 2026 · US
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Hollow cathodes
Hollow cathodes · Cooperative Patent Classification (CPC)
Electric circuits, power, telecommunications, and semiconductors.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | H05H1/481 |
| Official title | {Hollow cathodes} |
| Display label | Hollow cathodes |
| Total patents | 21 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is rapidly declining.
| Year | Patents |
|---|---|
| 2016 | 1 |
| 2018 | 2 |
| 2019 | 1 |
| 2020 | 1 |
| 2021 | 3 |
| 2022 | 1 |
| 2023 | 5 |
| 2024 | 4 |
| 2025 | 1 |
| 2026 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Decoratively coated polymer substrates and process for obtaining the same
US-2026043140-A1 · Feb 12, 2026 · US
Nano-catalysts synthesis method
US-2025073693-A1 · Mar 6, 2025 · US
Method of producing a water repellent coating onto textile substrates using a plasma generated by hollow cathodes
US-2024279811-A1 · Aug 22, 2024 · US
Annular hollow cathode
US-11937361-B1 · Mar 19, 2024 · US
Hollow cathode system for generating a plasma and method for operating such a hollow cathode system
US-2024062995-A1 · Feb 22, 2024 · US
Discharge device and hair care device
US-11889907-B2 · Feb 6, 2024 · US
Compositions for treatment of cancer, methods and systems for forming the same
US-11771770-B2 · Oct 3, 2023 · US
Hollow cathode apparatus
US-11690161-B2 · Jun 27, 2023 · US
Methods and apparatuses for emitting electrons from a hollow cathode
US-11596049-B2 · Feb 28, 2023 · US
Silicon oxide coated polymer films and low pressure pecvd methods for producing the same
US-2023054056-A1 · Feb 23, 2023 · US
Plasma source and switch device
US-2023053887-A1 · Feb 23, 2023 · US
Discharge cell systems and methods
US-11229113-B1 · Jan 18, 2022 · US
Discharge device and hair care device
US-2021315349-A1 · Oct 14, 2021 · US
Methods and apparatuses for emitting electrons from a hollow cathode
US-2021204388-A1 · Jul 1, 2021 · US
Hollow Cathode Apparatus
US-2021100089-A1 · Apr 1, 2021 · US
Hollow cathode plasma source
US-10586685-B2 · Mar 10, 2020 · US
Compositions for treatment of cancer, methods and systems for forming the same
US-2019076537-A1 · Mar 14, 2019 · US
Simplified formation process of a low work function insert
US-10002738-B1 · Jun 19, 2018 · US
Hollow cathode plasma source
US-2018025892-A1 · Jan 25, 2018 · US