H01J 2201/19
Thermionic cathodes
H01J2201/19 (Thermionic cathodes) appears on 45 US grants and 41 published applications in this corpus.
Search patents in H01J- Granted patents
- 45
- Published applications
- 41
- Assignees
- 32
- Inventors
- 82
- Latest grant
- 19 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1998 | 1 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 2 | 0 |
| 2002 | 2 | 0 |
| 2003 | 1 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 1 |
| 2006 | 0 | 0 |
| 2007 | 1 | 0 |
| 2008 | 0 | 0 |
| 2009 | 1 | 5 |
| 2010 | 0 | 2 |
| 2011 | 4 | 0 |
| 2012 | 0 | 2 |
| 2013 | 1 | 2 |
| 2014 | 2 | 0 |
| 2015 | 0 | 0 |
| 2016 | 4 | 1 |
| 2017 | 1 | 1 |
| 2018 | 1 | 0 |
| 2019 | 0 | 1 |
| 2020 | 2 | 0 |
| 2021 | 2 | 4 |
| 2022 | 3 | 4 |
| 2023 | 3 | 6 |
| 2024 | 7 | 8 |
| 2025 | 3 | 3 |
| 2026 | 3 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Electron source and method for manufacturing same, and emitter and device provided with same19 May 2026US 12,633,487 B2Denka Company Limited
- Emitter and device comprising same24 Mar 2026US 12,586,747 B2Denka Company Limited
- Charged particle beam source13 Jan 2026US 12,525,420 B2FEI Company
- Electron gun cathode mount18 Mar 2025US 12,255,038 B2TWI Ltd.
- Monolithic heater for thermionic electron cathode25 Feb 2025US 12,237,138 B2Applied Physics Technologies, Inc.
- Electron beam adjustment method, electron beam writing apparatus, and non-transitory computer-readable storage medium storing a program29 Jan 2026US 2026/0031298 A1NuFlare Technology, Inc.
- Plasma Electron Beam Installation System11 Dec 2025US 2025/0379027 A1
- Emitter and device comprising same3 Jul 2025US 2025/0218717 A1Denka Company Limited
- Cathode assemblies, methods for adjusting focal points of x-rays, and methods for controlling focused electron beams27 Mar 2025US 2025/0104957 A1Wuhan United Imaging Healthcare Co., Ltd.
- Laminate, electron source and electronic device containing laminate, and production method and cleaning method for laminate28 Nov 2024US 2024/0395494 A1National Institute for Materials Science
Most cited
By later US patents
- Display device based on indirectly heated thermionic cathodes13US 5,831,382 A1998
- Electron emission materials and components11US 6,190,579 B1Integrated Thermal Sciences, Inc. · 2001
- High brightness thermionic cathode11US 7,176,610 B2Toshiba Machine America, Inc. · 2007
- Thermionic emitter with balancing thermal conduction legs10US 6,426,587 B1Siemens Aktiengesellschaft · 2002
- Electron emission materials and components7US 6,051,165 AIntegrated Thermal Sciences, Inc. · 2000