H01J 2203/02
Electron guns
H01J2203/02 (Electron guns) appears on 81 US grants and 67 published applications in this corpus.
Search patents in H01J- Granted patents
- 81
- Published applications
- 67
- Assignees
- 42
- Inventors
- 190
- Latest grant
- 4 Nov 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 2 | 0 |
| 1997 | 1 | 0 |
| 1998 | 4 | 0 |
| 1999 | 2 | 0 |
| 2000 | 6 | 0 |
| 2001 | 3 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 1 |
| 2004 | 1 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 2 |
| 2007 | 0 | 4 |
| 2008 | 3 | 1 |
| 2009 | 1 | 8 |
| 2010 | 3 | 6 |
| 2011 | 5 | 7 |
| 2012 | 5 | 4 |
| 2013 | 6 | 7 |
| 2014 | 5 | 5 |
| 2015 | 4 | 4 |
| 2016 | 3 | 5 |
| 2017 | 9 | 2 |
| 2018 | 2 | 0 |
| 2019 | 1 | 0 |
| 2020 | 1 | 0 |
| 2021 | 1 | 1 |
| 2022 | 2 | 3 |
| 2023 | 1 | 4 |
| 2024 | 2 | 3 |
| 2025 | 5 | 0 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Energy tuner for a gated field emission cathode device, and associated method4 Nov 2025US 12,463,002 B2NCX Corporation
- Field emission cathode device and method for forming a field emission cathode device15 Apr 2025US 12,278,078 B2NCX Corporation
- Pulsed generator of electrically charged particles and method for using a pulsed generator of electrically charged particles15 Apr 2025US 12,278,082 B2Commissariat A L' Energie Atomique Et Aux Energies Alternatives
- Electron gun cathode mount18 Mar 2025US 12,255,038 B2TWI Ltd.
- Field emission cathode device and method of forming a field emission cathode device25 Feb 2025US 12,237,139 B2NCX Corporation
- Energy tuner for a gated field emission cathode device, and associated method11 Jul 2024US 2024/0234075 A1NCX Corporation
- An electron gun cathode mount18 Apr 2024US 2024/0128042 A1TWI Ltd.
- Field emission cathode device and method of forming a field emission cathode device7 Mar 2024US 2024/0079196 A1NCX Corporation
- Field emission cathode device and method of forming a field emission cathode device21 Dec 2023US 2023/0411101 A1NCX Corporation
- Field emission cathode device and method for forming a field emission cathode device16 Nov 2023US 2023/0369000 A1NCX Corporation
Most cited
By later US patents
- Source of spin polarized electrons using an emissive micropoint cathode44US 4,835,438 ACommissariat A L' Energie Atomique · 1989
- Virtual matrix control scheme for multiple spot X-ray source27US 7,826,594 B2General Electric Company · 2010
- Electron source, X-ray source and device using the X-ray source20US 10,014,148 B2Nuctech Company Limited · 2018
- Method and apparatus for storing data using spin-polarized electrons12US 5,546,337 ATeraStore, Inc. · 1996
- Field emission displays with reduced light leakage9US 5,956,611 AMicron Technologies, Inc. · 1999