H01J 1/304
Field-emissive cathodes
H01J1/304 (Field-emissive cathodes) appears on 1,385 US grants and 1,127 published applications in this corpus.
Search patents in H01J- Granted patents
- 1,385
- Published applications
- 1,127
- Assignees
- 463
- Inventors
- 2,169
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 2 | 0 |
| 1978 | 2 | 0 |
| 1979 | 6 | 0 |
| 1980 | 1 | 0 |
| 1981 | 2 | 0 |
| 1982 | 3 | 0 |
| 1983 | 2 | 0 |
| 1984 | 0 | 0 |
| 1985 | 2 | 0 |
| 1986 | 3 | 0 |
| 1987 | 2 | 0 |
| 1988 | 2 | 0 |
| 1989 | 3 | 0 |
| 1990 | 8 | 0 |
| 1991 | 11 | 0 |
| 1992 | 15 | 0 |
| 1993 | 19 | 0 |
| 1994 | 16 | 0 |
| 1995 | 28 | 0 |
| 1996 | 49 | 0 |
| 1997 | 46 | 0 |
| 1998 | 71 | 0 |
| 1999 | 46 | 0 |
| 2000 | 40 | 0 |
| 2001 | 35 | 21 |
| 2002 | 45 | 63 |
| 2003 | 55 | 63 |
| 2004 | 71 | 101 |
| 2005 | 67 | 103 |
| 2006 | 63 | 106 |
| 2007 | 51 | 104 |
| 2008 | 52 | 61 |
| 2009 | 55 | 77 |
| 2010 | 71 | 65 |
| 2011 | 72 | 52 |
| 2012 | 47 | 35 |
| 2013 | 45 | 38 |
| 2014 | 31 | 32 |
| 2015 | 34 | 28 |
| 2016 | 29 | 18 |
| 2017 | 27 | 21 |
| 2018 | 19 | 13 |
| 2019 | 17 | 29 |
| 2020 | 32 | 12 |
| 2021 | 17 | 23 |
| 2022 | 15 | 17 |
| 2023 | 17 | 16 |
| 2024 | 17 | 11 |
| 2025 | 15 | 13 |
| 2026 | 5 | 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
- Hydrogen activation/ionization accelerating apparatus having fingerprint-type panel stack structure25 Aug 2026US 12,719,068 B2
- Emitter and field emission assembly including the same7 Jul 2026US 12,676,276 B2AweXome Ray, Inc.
- Systems and methods for fabricating silicon die stacks for electron emitter array chips26 May 2026US 12,640,326 B2
- Modular getters and getters with different materials in vacuum enclosures31 Mar 2026US 12,592,354 B2Varex Imaging Corporation
- 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
- Electron emission source18 Jun 2026US 2026/0171342 A1Infovion Inc.
- Backend field emission devices19 Mar 2026US 2026/0081089 A1
- 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
- Very high speed integrated microelectronic tubes410US 4,721,885 ASRI International · 1988
- Electron source with micropoint emissive cathodes and display means by cathodoluminescence excited by field emission using said source400US 4,940,916 ACommissariat A L' Energie Atomique · 1990
- 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