H01J 2329/04
Cathode electrodes
H01J2329/04 (Cathode electrodes) appears on 180 US grants and 237 published applications in this corpus.
Search patents in H01J- Granted patents
- 180
- Published applications
- 237
- Assignees
- 74
- Inventors
- 410
- Latest grant
- 15 Jul 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 3 | 0 |
| 2000 | 2 | 0 |
| 2001 | 3 | 2 |
| 2002 | 2 | 3 |
| 2003 | 5 | 3 |
| 2004 | 4 | 6 |
| 2005 | 3 | 10 |
| 2006 | 6 | 14 |
| 2007 | 11 | 12 |
| 2008 | 7 | 29 |
| 2009 | 3 | 46 |
| 2010 | 19 | 36 |
| 2011 | 24 | 26 |
| 2012 | 26 | 17 |
| 2013 | 26 | 12 |
| 2014 | 4 | 6 |
| 2015 | 11 | 7 |
| 2016 | 9 | 2 |
| 2017 | 4 | 0 |
| 2018 | 2 | 1 |
| 2019 | 0 | 2 |
| 2020 | 2 | 0 |
| 2021 | 1 | 0 |
| 2022 | 0 | 0 |
| 2023 | 0 | 1 |
| 2024 | 0 | 1 |
| 2025 | 1 | 0 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- H01J 2329/0407Field emission cathodesIndexing code108
- H01J 2329/0486Cold cathodes having an electric field parallel to the surface thereofIndexing code56
- H01J 2329/0481Cold cathodes having an electric field perpendicular to the surface thereofIndexing code14
- H01J 2329/0494Circuit elements associated with the emitters by direct integrationIndexing code13
- H01J 2329/0478Semiconductor cathodesIndexing code5
- H01J 2329/0492Cold cathodes combined with other synergetic effectsIndexing code2
- H01J 2329/0402Thermionic cathodesIndexing code1
- H01J 2329/0405Cold cathodes other than those covered by h01j2329/0407 - h01j2329/0492Indexing code0
All 9 subgroupsShow fewer
Recent patents
- Carbon nanotube based cold cathodes for x-ray generation15 Jul 2025US 12,362,125 B2
- Patterned focal plane arrays of carbon nanotube thin film bolometers with high temperature coefficient of resistance and improved detectivity for infrared imaging2 Feb 2021US 10,908,025 B2Carbon Solutions, Inc.
- Infrared optical sensor and manufacturing method thereof1 Dec 2020US 10,854,445 B2Electronics and Telecommunications Research Institute
- Optically addressed, thermionic electron beam device11 Aug 2020US 10,741,352 B2The Board of Trustees of the Leland Stanford Junior University
- Devices for carbon nanotube length control18 Sep 2018US 10,077,191 B2Korea University Research and Business Foundation
- Carbon nanotube based cold cathodes for x-ray generation26 Feb 2026US 2026/0058086 A1Carestream Dental LLC
- Carbon nanotube based cold cathodes for x-ray generation22 Feb 2024US 2024/0062984 A1
- Electron source based on field emission and production process for same5 Jan 2023US 2023/0005695 A1Centre National De La Recherche Scientifique
- Infrared optical sensor and manufacturing method thereof12 Dec 2019US 2019/0378716 A1Electronics and Telecommunications Research Institute
- Optically addressed, thermionic electron beam device7 Nov 2019US 2019/0341217 A1The Board of Trustees of the Leland Stanford Junior University
Most cited
By later US patents
- Electron-emitting device, electron source and image-forming apparatus as well as method of manufacturing the same94US 6,246,168 B1Canon Kabushiki Kaisha · 2001
- Electron-emitting device, electron source and image-forming apparatus65US 6,169,356 ACanon Kabushiki Kaisha · 2001
- Method of manufacturing electron-emitting device electron source and image-forming apparatus54US 6,179,678 B2Canon Kabushiki Kaisha · 2001
- Image formation apparatus41US 6,879,096 B1Canon Kabushiki Kaisha · 2005
- Enhanced field emission from carbon nanotubes mixed with particles34US 6,798,127 B2Nano-Proprietary, Inc. · 2004