H01J 2201/00
Electrodes common to discharge tubes
H01J2201/00 (Electrodes common to discharge tubes) appears on 2,198 US grants and 1,575 published applications in this corpus.
Search patents in H01J- Granted patents
- 2,198
- Published applications
- 1,575
- Assignees
- 613
- Inventors
- 3,156
- Latest grant
- 15 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 17 | 0 |
| 1977 | 14 | 0 |
| 1978 | 12 | 0 |
| 1979 | 3 | 0 |
| 1980 | 2 | 0 |
| 1981 | 5 | 0 |
| 1982 | 4 | 0 |
| 1983 | 1 | 0 |
| 1984 | 3 | 0 |
| 1985 | 4 | 0 |
| 1986 | 8 | 0 |
| 1987 | 12 | 0 |
| 1988 | 8 | 0 |
| 1989 | 11 | 0 |
| 1990 | 13 | 0 |
| 1991 | 14 | 0 |
| 1992 | 20 | 0 |
| 1993 | 19 | 0 |
| 1994 | 32 | 0 |
| 1995 | 44 | 0 |
| 1996 | 90 | 0 |
| 1997 | 100 | 0 |
| 1998 | 130 | 0 |
| 1999 | 96 | 0 |
| 2000 | 110 | 0 |
| 2001 | 78 | 31 |
| 2002 | 98 | 122 |
| 2003 | 98 | 103 |
| 2004 | 112 | 147 |
| 2005 | 94 | 159 |
| 2006 | 95 | 154 |
| 2007 | 83 | 133 |
| 2008 | 76 | 99 |
| 2009 | 59 | 96 |
| 2010 | 99 | 86 |
| 2011 | 87 | 59 |
| 2012 | 56 | 40 |
| 2013 | 47 | 34 |
| 2014 | 35 | 21 |
| 2015 | 32 | 32 |
| 2016 | 35 | 24 |
| 2017 | 25 | 18 |
| 2018 | 21 | 16 |
| 2019 | 21 | 33 |
| 2020 | 39 | 20 |
| 2021 | 27 | 32 |
| 2022 | 23 | 27 |
| 2023 | 22 | 30 |
| 2024 | 23 | 32 |
| 2025 | 30 | 18 |
| 2026 | 11 | 9 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- H01J 2201/30Cold cathodesIndexing code1,872
- H01J 2201/34Photoemissive electrodesIndexing code207
- H01J 2201/32Secondary emission electrodesIndexing code77
- H01J 2201/19Thermionic cathodesIndexing code45
- H01J 2201/28Heaters for thermionic cathodesIndexing code45
- H01J 2201/02Arrangements for eliminating deleterious effectsIndexing code24
Recent patents
- Electron beam applicator and creation method of detection data in electron beam applicator15 Sep 2026US 12,738,441 B2Photo electron Soul Inc.
- 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.
- Photocathode including nanostructures for extended wavelengths16 Jun 2026US 12,658,397 B2L3Harris Technologies, Inc.
- Systems and methods for fabricating silicon die stacks for electron emitter array chips26 May 2026US 12,640,326 B2
- X-ray devices with nanotube emitters and methods of forming8 Oct 2026US 2026/0311951 A1Varex Imaging Corporation
- Field emission device having automatic current limiter10 Sep 2026US 2026/0269165 A1LG Electronics Inc.
- Sintered material, method for producing same, and electron source and device provided with same13 Aug 2026US 2026/0233304 A1
- 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
Most cited
By later US patents
- 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
- Polymeric compositions for manufacture of secondary electron multiplier tubes and method for manufacture thereof291US 4,093,562 AMatsushita Electric Industrial Co., Ltd. · 1978