H01J 3/024
Electron guns using thermionic emission of cathode heated by electron or ion
Official title: {Electron guns using thermionic emission of cathode heated by electron or ion bombardment or by irradiation by other energetic beams, e.g. by laser}
H01J3/024 (Electron guns using thermionic emission of cathode heated by electron or ion) appears on 21 US grants and 19 published applications in this corpus.
Search patents in H01J- Granted patents
- 21
- Published applications
- 19
- Assignees
- 30
- Inventors
- 69
- Latest grant
- 24 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 1 | 0 |
| 2003 | 0 | 0 |
| 2004 | 2 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 1 |
| 2007 | 0 | 1 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 1 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 1 |
| 2014 | 1 | 2 |
| 2015 | 1 | 2 |
| 2016 | 2 | 1 |
| 2017 | 0 | 2 |
| 2018 | 0 | 1 |
| 2019 | 1 | 1 |
| 2020 | 4 | 2 |
| 2021 | 1 | 0 |
| 2022 | 0 | 0 |
| 2023 | 0 | 1 |
| 2024 | 0 | 2 |
| 2025 | 1 | 2 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Emitter and device comprising same24 Mar 2026US 12,586,747 B2Denka Company Limited
- Electron gun cathode mount18 Mar 2025US 12,255,038 B2TWI Ltd.
- Electron gun16 Mar 2021US 10,950,407 B2New Japan Radio Co., Ltd.
- External grid-controlled hot cathode array electron gun27 Oct 2020US 10,818,464 B2Nuctech Company Limited
- Optically addressed, thermionic electron beam device11 Aug 2020US 10,741,352 B2The Board of Trustees of the Leland Stanford Junior University
- Light detection through enhanced electron emission30 Oct 2025US 2025/0338031 A1Massachusetts Institute of Technology
- Emitter and device comprising same3 Jul 2025US 2025/0218717 A1Denka Company Limited
- Cathode based on the material c12a7: e (electride) for thermionic electron emission and method for using same10 Oct 2024US 2024/0339280 A1Advanced Thermal Devices S.L.
- An electron gun cathode mount18 Apr 2024US 2024/0128042 A1TWI Ltd.
- Emitter for emitting charged particles18 May 2023US 2023/0154725 A1ASML Netherlands B. V.
Most cited
By later US patents
- Wire ion plasma gun68US 4,786,844 ARPC Industries · 1988
- Laser generated high electron density source14US 4,346,330 AThermo Electron Corporation · 1982
- Electron beam heated thermionic cathode7US 4,583,023 AAvco Everett Research Laboratory, Inc. · 1986
- Inspection apparatus6US 8,742,344 B2Ebara Corporation · 2014
- Electron guns for electron beam tools5US 10,573,481 B1NuFlare Technology America, Inc. · 2020