Electron multiplier production method and electron multiplier
US-10522334-B2 · Dec 31, 2019 · US
Photo-emissive cathodes (H01J1/35 takes precedence)
Photo-emissive cathodes (H01J1/35 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 | H01J1/34 |
| Official title | Photo-emissive cathodes (H01J1/35 takes precedence) |
| Display label | Photo-emissive cathodes (H01J1/35 takes precedence) |
| Total patents | 149 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 6 |
| 2016 | 17 |
| 2017 | 12 |
| 2018 | 13 |
| 2019 | 16 |
| 2020 | 24 |
| 2021 | 15 |
| 2022 | 7 |
| 2023 | 14 |
| 2024 | 13 |
| 2025 | 12 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Ruthenium encapsulated photocathode electron emitter
US-10395884-B2 · Aug 27, 2019 · US
Electron photoemission with tunable excitation and transport energetics
US-10381187-B1 · Aug 13, 2019 · US
Photocathodes with protective in-situ graphene gas barrier films and method of making the same
US-10354828-B1 · Jul 16, 2019 · US
Image intensifier with stray particle shield
US-10332732-B1 · Jun 25, 2019 · US
Passive local area saturation of electron bombarded gain
US-10312047-B1 · Jun 4, 2019 · US
Ruthenium encapsulated photocathode electron emitter
US-2019108966-A1 · Apr 11, 2019 · US
Silicon electron emitter designs
US-2019108963-A1 · Apr 11, 2019 · US
Photocathode designs and methods of generating an electron beam using a photocathode
US-2019108964-A1 · Apr 11, 2019 · US
Thermally assisted negative electron affinity photocathode
US-2019080875-A1 · Mar 14, 2019 · US
Photocathode including silicon substrate with boron layer
US-2019066962-A1 · Feb 28, 2019 · US
Photocathode including silicon substrate with boron layer
US-10199197-B2 · Feb 5, 2019 · US
Inspection device
US-10157722-B2 · Dec 18, 2018 · US
Electron source
US-10133181-B2 · Nov 20, 2018 · US
Electron injector and free electron laser
US-10103508-B2 · Oct 16, 2018 · US
Radio frequency field immersed ultra-low temperature electron source
US-10051720-B1 · Aug 14, 2018 · US
Thin Diamond Film Bonding Providing Low Vapor Pressure at High Temperature
US-2018154609-A1 · Jun 7, 2018 · US
High brightness boron-containing electron beam emitters for use in a vacuum environment
US-9984846-B2 · May 29, 2018 · US
Activation chamber, kit used in treatment device and treatment device, for lowering electron affinity
US-9934926-B2 · Apr 3, 2018 · US
Bonding method for thin film diamond providing low vapor pressure at high temperature
US-9914283-B2 · Mar 13, 2018 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC H01J1/34?
- CPC H01J1/34 is the Cooperative Patent Classification code for “Photo-emissive cathodes (H01J1/35 takes precedence).”
- How many patents are filed under CPC H01J1/34 (Photo-emissive cathodes (H01J1/35 takes precedence))?
- Our database includes 149 publications tagged with this CPC code.
- Is patent activity under CPC H01J1/34 growing?
- Publication counts under this code: 13 in 2024 vs 12 in 2025 (latest complete years).