H01J 29/48
Electron guns
H01J29/48 (Electron guns) appears on 1,082 US grants and 443 published applications in this corpus.
Search patents in H01J- Granted patents
- 1,082
- Published applications
- 443
- Assignees
- 207
- Inventors
- 1,327
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 22 | 0 |
| 1977 | 13 | 0 |
| 1978 | 20 | 0 |
| 1979 | 10 | 0 |
| 1980 | 13 | 0 |
| 1981 | 18 | 0 |
| 1982 | 20 | 0 |
| 1983 | 20 | 0 |
| 1984 | 17 | 0 |
| 1985 | 31 | 0 |
| 1986 | 33 | 0 |
| 1987 | 28 | 0 |
| 1988 | 22 | 0 |
| 1989 | 30 | 0 |
| 1990 | 23 | 0 |
| 1991 | 26 | 0 |
| 1992 | 18 | 0 |
| 1993 | 21 | 0 |
| 1994 | 16 | 0 |
| 1995 | 26 | 0 |
| 1996 | 28 | 0 |
| 1997 | 31 | 0 |
| 1998 | 50 | 0 |
| 1999 | 57 | 0 |
| 2000 | 38 | 0 |
| 2001 | 44 | 24 |
| 2002 | 70 | 67 |
| 2003 | 66 | 44 |
| 2004 | 40 | 49 |
| 2005 | 28 | 58 |
| 2006 | 33 | 44 |
| 2007 | 22 | 44 |
| 2008 | 22 | 13 |
| 2009 | 19 | 8 |
| 2010 | 18 | 7 |
| 2011 | 7 | 5 |
| 2012 | 3 | 2 |
| 2013 | 4 | 15 |
| 2014 | 7 | 8 |
| 2015 | 14 | 7 |
| 2016 | 6 | 6 |
| 2017 | 8 | 6 |
| 2018 | 10 | 11 |
| 2019 | 5 | 6 |
| 2020 | 8 | 5 |
| 2021 | 6 | 4 |
| 2022 | 5 | 4 |
| 2023 | 2 | 2 |
| 2024 | 2 | 1 |
| 2025 | 1 | 1 |
| 2026 | 1 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- H01J 29/50Two or more guns in a single vacuum space509
- H01J 29/488Schematic arrangements of the electrodes for beam forming199
- H01J 29/481Electron guns using field-emission, photo-emission, or secondary-emission electron source171
- H01J 29/485Construction of the gun or of parts thereof156
- H01J 29/51Arrangements for controlling convergence of a plurality of beams by means of59
- H01J 29/484Eliminating deleterious effects due to thermal effects, electrical or magnetic fields55
- H01J 29/482Electron guns using electron multiplication19
- H01J 29/487Replacing parts of the gun3
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
- Wireless communication apparatus and method for generating midamble and controlling transmission power11 Feb 2025US 12,224,892 B2Sony Group Corporation
- 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 photoinjector24 Jan 2023US 11,562,874 B2Arizona Board of Regents on behalf of Arizona State University
- Pulsed electron beam source with gap dominant integrated energy storage and ultrafast capability25 Jun 2026US 2026/0179872 A1
- Superconducting cryo module5 Feb 2026US 2026/0038761 A1Mitsubishi Heavy Industries Machinery Systems, Ltd.
- Ultraviolet cathode ray tube6 Nov 2025US 2025/0343019 A1Shanghai Jiyouwei Optoelectronics Tech. Co., 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.
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