H01J 29/481
Electron guns using field-emission, photo-emission, or secondary-emission electron source
Official title: {Electron guns using field-emission, photo-emission, or secondary-emission electron source}
H01J29/481 (Electron guns using field-emission, photo-emission, or secondary-emission electron source) appears on 171 US grants and 207 published applications in this corpus.
Search patents in H01J- Granted patents
- 171
- Published applications
- 207
- Assignees
- 78
- Inventors
- 391
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 3 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 2 | 0 |
| 1997 | 2 | 0 |
| 1998 | 1 | 0 |
| 1999 | 3 | 0 |
| 2000 | 1 | 0 |
| 2001 | 3 | 1 |
| 2002 | 8 | 5 |
| 2003 | 4 | 10 |
| 2004 | 6 | 25 |
| 2005 | 10 | 36 |
| 2006 | 15 | 32 |
| 2007 | 13 | 37 |
| 2008 | 19 | 12 |
| 2009 | 17 | 6 |
| 2010 | 15 | 6 |
| 2011 | 6 | 3 |
| 2012 | 3 | 1 |
| 2013 | 3 | 10 |
| 2014 | 6 | 7 |
| 2015 | 8 | 1 |
| 2016 | 2 | 2 |
| 2017 | 3 | 4 |
| 2018 | 1 | 1 |
| 2019 | 3 | 0 |
| 2020 | 2 | 2 |
| 2021 | 2 | 1 |
| 2022 | 2 | 1 |
| 2023 | 0 | 2 |
| 2024 | 2 | 1 |
| 2025 | 0 | 0 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Electron emission methods to generate electron beams with a narrow energy distribution25 Aug 2026US 12,719,005 B2The Regents of the University of California
- Power supply circuit and field emission electron source19 Nov 2024US 12,149,170 B2NuRay Technology Co., Ltd.
- Regulated charged particle beam emitter systems and methods13 Feb 2024US 11,899,159 B2Schlumberger Technology Corporation
- Electron source and electron source unit18 Oct 2022US 11,476,075 B2Japan Aerospace Exploration Agency
- Field emission device24 May 2022US 11,342,153 B2Electronics and Telecommunications Research Institute
- Superconducting cryo module5 Feb 2026US 2026/0038761 A1Mitsubishi Heavy Industries Machinery Systems, Ltd.
- Electron emission methods to generate electron beams with a narrow energy distribution2 May 2024US 2024/0145204 A1The Regents of the University of California
- Power supply circuit and field emission electron source2 Feb 2023US 2023/0036712 A1NuRay Technology Co., Ltd.
- Electron source based on field emission and production process for same5 Jan 2023US 2023/0005695 A1Centre National De La Recherche Scientifique
- Electron source and electron source unit19 May 2022US 2022/0157551 A1Japan Aerospace Exploration Agency
Most cited
By later US patents
- Integrally controlled field emission flat display device121US 5,212,426 AMotorola, Inc. · 1993
- Method to form self-aligned tips for flat panel displays109US 5,151,061 AMicron Technology, Inc. · 1992
- Electron-emitting device, electron source and image-forming apparatus as well as method of manufacturing the same94US 6,246,168 B1Canon Kabushiki Kaisha · 2001
- CRT with field-emission cathode75US 4,178,531 ARCA Corporation · 1979
- Display device and cathode ray tube69US 6,528,958 B2Koninklijke Philips Electronics N. V. · 2003