H01J 9/025
Of field emission cathodes
Official title: {of field emission cathodes}
H01J9/025 (Of field emission cathodes) appears on 1,687 US grants and 1,229 published applications in this corpus.
Search patents in H01J- Granted patents
- 1,687
- Published applications
- 1,229
- Assignees
- 467
- Inventors
- 2,288
- Latest grant
- 26 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 3 | 0 |
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 3 | 0 |
| 1982 | 3 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 2 | 0 |
| 1990 | 7 | 0 |
| 1991 | 10 | 0 |
| 1992 | 25 | 0 |
| 1993 | 32 | 0 |
| 1994 | 29 | 0 |
| 1995 | 39 | 0 |
| 1996 | 49 | 0 |
| 1997 | 74 | 0 |
| 1998 | 87 | 0 |
| 1999 | 111 | 0 |
| 2000 | 100 | 0 |
| 2001 | 82 | 38 |
| 2002 | 80 | 99 |
| 2003 | 83 | 94 |
| 2004 | 85 | 111 |
| 2005 | 74 | 120 |
| 2006 | 69 | 139 |
| 2007 | 56 | 117 |
| 2008 | 62 | 85 |
| 2009 | 58 | 69 |
| 2010 | 72 | 61 |
| 2011 | 76 | 45 |
| 2012 | 47 | 33 |
| 2013 | 43 | 40 |
| 2014 | 34 | 25 |
| 2015 | 36 | 25 |
| 2016 | 21 | 18 |
| 2017 | 24 | 15 |
| 2018 | 20 | 16 |
| 2019 | 16 | 21 |
| 2020 | 20 | 9 |
| 2021 | 10 | 10 |
| 2022 | 7 | 11 |
| 2023 | 9 | 11 |
| 2024 | 10 | 9 |
| 2025 | 15 | 4 |
| 2026 | 1 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Systems and methods for fabricating silicon die stacks for electron emitter array chips26 May 2026US 12,640,326 B2
- Electron source, electron beam device, and method for manufacturing electron source9 Dec 2025US 12,494,338 B2Hitachi High-Tech Corporation
- Quasi-macroscopic cold cathode field emission electron gun and manufacturing method thereof11 Nov 2025US 12,469,663 B2Zhengzhou University of Aeronautics
- Methods of forming a field emission cathode4 Nov 2025US 12,462,999 B2NCX Corporation
- Cathode member for electron beam generation, and method for manufacturing the same7 Oct 2025US 12,437,953 B2Kobelco Research Institute, Inc.
- Field emission device having automatic current limiter10 Sep 2026US 2026/0269165 A1LG Electronics Inc.
- Silicon carbide based triode electron emitter and producing an electron beam with same23 Jul 2026US 2026/0213110 A1
- Carbon nanotube based cold cathodes for x-ray generation26 Feb 2026US 2026/0058086 A1Carestream Dental LLC
- Field emitter and method for manufacturing same15 Jan 2026US 2026/0018362 A1Suzhou Institute of Nano-Tech and Nano-Bionics (Sinano) , Chinese Academy of Sciences
- Junction between hexaboride-containing and tantalum-containing components20 Nov 2025US 2025/0357069 A1FEI Company
Most cited
By later US patents
- Method for manufacturing porous structure and method for forming pattern645US 6,565,763 B1Kabushiki Kaisha Toshiba · 2003
- Self-oriented bundles of carbon nanotubes and method of making same326US 6,232,706 B1The Board of Trustees of the Leland Stanford Junior University · 2001
- Vertical microelectronic field emission devices312US 5,475,280 AMcnc · 1995
- Microelectronic and microelectromechanical devices comprising carbon nanotube components, and methods of making same295US 6,445,006 B1Advanced Technology Materials, Inc. · 2002
- Method to form self-aligned gate structures around cold cathode emitter tips using chemical mechanical polishing technology285US 5,229,331 AMicron Technology, Inc. · 1993