H01J 2209/0223
Field emission cathodes
H01J2209/0223 (Field emission cathodes) appears on 103 US grants and 54 published applications in this corpus.
Search patents in H01J- Granted patents
- 103
- Published applications
- 54
- Assignees
- 59
- Inventors
- 185
- Latest grant
- 12 Aug 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1991 | 1 | 0 |
| 1992 | 3 | 0 |
| 1993 | 8 | 0 |
| 1994 | 2 | 0 |
| 1995 | 5 | 0 |
| 1996 | 2 | 0 |
| 1997 | 5 | 0 |
| 1998 | 2 | 0 |
| 1999 | 5 | 0 |
| 2000 | 10 | 0 |
| 2001 | 6 | 1 |
| 2002 | 6 | 3 |
| 2003 | 3 | 1 |
| 2004 | 2 | 10 |
| 2005 | 4 | 2 |
| 2006 | 6 | 5 |
| 2007 | 4 | 3 |
| 2008 | 0 | 2 |
| 2009 | 1 | 1 |
| 2010 | 2 | 1 |
| 2011 | 0 | 2 |
| 2012 | 3 | 1 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 2 |
| 2017 | 6 | 5 |
| 2018 | 6 | 6 |
| 2019 | 3 | 2 |
| 2020 | 2 | 1 |
| 2021 | 1 | 1 |
| 2022 | 1 | 1 |
| 2023 | 1 | 0 |
| 2024 | 1 | 2 |
| 2025 | 2 | 1 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Electrode and filament coupled by adapter12 Aug 2025US 12,387,902 B1FEI Company
- Carbon nanotube based cold cathodes for x-ray generation15 Jul 2025US 12,362,125 B2
- Emitter, electron gun in which same is used, electronic device in which same is used, and method for manufacturing same14 May 2024US 11,984,294 B2National Institute for Materials Science
- Electron emitter and method of fabricating same27 Jun 2023US 11,688,579 B2ASML Netherlands B. V.
- Emitter, electron gun in which same is used, electronic device in which same is used, and method for manufacturing same16 Aug 2022US 11,417,491 B2National Institute for Materials Science
- Carbon nanotube based cold cathodes for x-ray generation26 Feb 2026US 2026/0058086 A1Carestream Dental LLC
- Junction between hexaboride-containing and tantalum-containing components20 Nov 2025US 2025/0357069 A1FEI Company
- Emitter, electron gun in which same is used, electronic device in which same is used, and method for manufacturing same7 Mar 2024US 2024/0079198 A1National Institute for Materials Science
- Carbon nanotube based cold cathodes for x-ray generation22 Feb 2024US 2024/0062984 A1
- Electron emitter and method of fabricating same16 Jun 2022US 2022/0189725 A1ASML Netherlands B. V.
Most cited
By later US patents
- Method to form self-aligned gate structures around cold cathode emitter tips using chemical mechanical polishing technology285US 5,229,331 AMicron Technology, Inc. · 1993
- Method to form self-aligned gate structures and focus rings158US 5,186,670 AMicron Technology, Inc. · 1993
- Method to form self-aligned gate structures around cold cathode emitter tips using chemical mechanical polishing technology146US 5,372,973 AMicron Technology, Inc. · 1994
- Method of making superhard tips for micro-probe microscopy and field emission116US 5,393,647 A1995
- Method to form self-aligned tips for flat panel displays109US 5,151,061 AMicron Technology, Inc. · 1992