H01J 2201/30403
Characterised by the emitter shape
Official title: characterised by the emitter shape
H01J2201/30403 (Characterised by the emitter shape) appears on 433 US grants and 226 published applications in this corpus.
Search patents in H01J- Granted patents
- 433
- Published applications
- 226
- Assignees
- 166
- Inventors
- 715
- Latest grant
- 7 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 6 | 0 |
| 1994 | 9 | 0 |
| 1995 | 15 | 0 |
| 1996 | 30 | 0 |
| 1997 | 38 | 0 |
| 1998 | 50 | 0 |
| 1999 | 30 | 0 |
| 2000 | 26 | 0 |
| 2001 | 15 | 7 |
| 2002 | 17 | 9 |
| 2003 | 18 | 9 |
| 2004 | 16 | 14 |
| 2005 | 7 | 13 |
| 2006 | 9 | 10 |
| 2007 | 9 | 3 |
| 2008 | 3 | 9 |
| 2009 | 2 | 14 |
| 2010 | 6 | 18 |
| 2011 | 9 | 14 |
| 2012 | 13 | 5 |
| 2013 | 3 | 10 |
| 2014 | 8 | 8 |
| 2015 | 10 | 8 |
| 2016 | 7 | 6 |
| 2017 | 9 | 6 |
| 2018 | 10 | 9 |
| 2019 | 4 | 11 |
| 2020 | 12 | 5 |
| 2021 | 10 | 13 |
| 2022 | 8 | 8 |
| 2023 | 8 | 4 |
| 2024 | 5 | 5 |
| 2025 | 5 | 5 |
| 2026 | 1 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- H01J 2201/30426Coatings on the emitter surfaceIndexing code107
- H01J 2201/30407Microengineered point emittersIndexing code96
- H01J 2201/30423Microengineered edge emittersIndexing code55
- H01J 2201/30434NanotubesIndexing code29
- H01J 2201/3043FibresIndexing code20
- H01J 2201/30419Pillar shaped emittersIndexing code5
- H01J 2201/30438ParticlesIndexing code3
- H01J 2201/30442WhiskersIndexing code1
Recent patents
- Emitter and field emission assembly including the same7 Jul 2026US 12,676,276 B2AweXome Ray, Inc.
- Extreme-ultraviolet light source device using electron beams21 Oct 2025US 12,451,316 B2Worldbeam Solution Co., Ltd.
- Emitter, field emission assembly and electromagnetic wave generator including the same16 Sep 2025US 12,417,891 B2LG Display Co., Ltd.
- Field emission assembly and electromagnetic wave generator including the same9 Sep 2025US 12,412,724 B2AweXome Ray, Inc.
- Field emission electron source, electron optical device, and manufacturing method26 Aug 2025US 12,400,820 B2Hitachi, Ltd.
- X-ray devices with nanotube emitters and methods of forming8 Oct 2026US 2026/0311951 A1Varex Imaging Corporation
- 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
- Cathodes having carbon nanotube (cnt) fibers wound onto graphite substrates or frameworks11 Dec 2025US 2025/0379018 A1Government of the United States as Represented by the Secretary of the Air Force
- Emitter, electron gun and electronic apparatus, and emitter manufacturing method4 Dec 2025US 2025/0372334 A1
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
- Field emission electron source188US 6,057,637 AThe Regents of the University of California · 2000
- Field emission device160US 4,663,559 A1987
- Method to form self-aligned gate structures around cold cathode emitter tips using chemical mechanical polishing technology146US 5,372,973 AMicron Technology, Inc. · 1994
- Field emission cathode having an electrically conducting material shaped of a narrow rod or knife edge128US 5,773,921 A1998