H01J 2201/304
Field emission cathodes
H01J2201/304 (Field emission cathodes) appears on 1,345 US grants and 1,180 published applications in this corpus.
Search patents in H01J- Granted patents
- 1,345
- Published applications
- 1,180
- Assignees
- 457
- Inventors
- 2,152
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 1 | 0 |
| 1979 | 2 | 0 |
| 1980 | 0 | 0 |
| 1981 | 2 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 2 | 0 |
| 1991 | 2 | 0 |
| 1992 | 6 | 0 |
| 1993 | 12 | 0 |
| 1994 | 18 | 0 |
| 1995 | 19 | 0 |
| 1996 | 40 | 0 |
| 1997 | 55 | 0 |
| 1998 | 75 | 0 |
| 1999 | 56 | 0 |
| 2000 | 53 | 0 |
| 2001 | 44 | 21 |
| 2002 | 49 | 82 |
| 2003 | 57 | 76 |
| 2004 | 74 | 117 |
| 2005 | 64 | 117 |
| 2006 | 70 | 112 |
| 2007 | 59 | 111 |
| 2008 | 59 | 81 |
| 2009 | 39 | 71 |
| 2010 | 76 | 66 |
| 2011 | 71 | 51 |
| 2012 | 46 | 33 |
| 2013 | 39 | 29 |
| 2014 | 28 | 21 |
| 2015 | 32 | 29 |
| 2016 | 29 | 20 |
| 2017 | 22 | 15 |
| 2018 | 18 | 11 |
| 2019 | 14 | 27 |
| 2020 | 26 | 10 |
| 2021 | 18 | 20 |
| 2022 | 15 | 19 |
| 2023 | 16 | 17 |
| 2024 | 13 | 12 |
| 2025 | 18 | 7 |
| 2026 | 2 | 5 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
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
- Emitter and field emission assembly including the same7 Jul 2026US 12,676,276 B2AweXome Ray, Inc.
- Systems, devices, and methods for multisource volumetric spectral computed tomography2 Dec 2025US 12,487,193 B2The University of North Carolina at Chapel Hill
- Methods of forming a field emission cathode4 Nov 2025US 12,462,999 B2NCX Corporation
- Extreme-ultraviolet light source device using electron beams21 Oct 2025US 12,451,316 B2Worldbeam Solution Co., Ltd.
- X-ray devices with nanotube emitters and methods of forming8 Oct 2026US 2026/0311951 A1Varex Imaging Corporation
- Silicon carbide based triode electron emitter and producing an electron beam with same23 Jul 2026US 2026/0213110 A1
- Backend field emission devices19 Mar 2026US 2026/0081089 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
Most cited
By later US patents
- 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
- 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
- Device comprising carbon nanotube field emitter structure and process for forming device254US 6,630,772 B1Agere Systems Inc. · 2003
- Free-standing and aligned carbon nanotubes and synthesis thereof254US 6,863,942 B2The Research Foundation of State University of New York · 2005