H01J 2201/308
Semiconductor cathodes
Official title: Semiconductor cathodes, e.g. having PN junction layers
H01J2201/308 (Semiconductor cathodes) appears on 20 US grants and 16 published applications in this corpus.
Search patents in H01J- Granted patents
- 20
- Published applications
- 16
- Assignees
- 12
- Inventors
- 39
- Latest grant
- 8 Apr 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 1 | 0 |
| 2000 | 0 | 0 |
| 2001 | 2 | 0 |
| 2002 | 0 | 1 |
| 2003 | 1 | 1 |
| 2004 | 1 | 0 |
| 2005 | 0 | 1 |
| 2006 | 0 | 0 |
| 2007 | 1 | 1 |
| 2008 | 0 | 0 |
| 2009 | 0 | 1 |
| 2010 | 1 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 1 | 4 |
| 2020 | 4 | 1 |
| 2021 | 1 | 0 |
| 2022 | 1 | 2 |
| 2023 | 1 | 0 |
| 2024 | 0 | 2 |
| 2025 | 1 | 2 |
By publication year. Applications have been published since 2001.
Recent patents
- Electron emitter structure, external photoelectric effect emitter, particle collecting device, tunnel surface emitter, semiconductor- based direct emitter and liquid ioniser comprising same, gas sensor comprising an emitter or emitter structure, method for generating free electrons, and method for collecting particles8 Apr 2025US 12,272,513 B2DBT GmbH
- Ultraviolet field-emission lamps and their applications3 Oct 2023US 11,776,802 B2NS Nanotech, Inc.
- Ultraviolet field-emission lamps and their applications28 Jun 2022US 11,373,853 B2NS Nanotech, Inc.
- Ultraviolet field-emission lamps and their applications13 Apr 2021US 10,978,290 B1NS Nanotech, Inc.
- Photocathode designs and methods of generating an electron beam using a photocathode13 Oct 2020US 10,804,069 B2KLA-Tencor Corporation
- Field emission device, and x-ray generation device using same27 Nov 2025US 2025/0364204 A1LG Electronics Inc.
- Package having field emission element and x-ray device having the same28 Aug 2025US 2025/0275297 A1LG Electronics Inc.
- Electron emitter structure, external photoelectric effect emitter, particle collecting device, tunnel surface emitter, semiconductor-based direct emitter and liquid ioniser comprising same, gas sensor comprising an emitter or emitter structure, method for generating free electrons, and method for collecting particles8 Aug 2024US 2024/0266134 A1DBT GmbH
- Ultraviolet field-emission lamps and their applications28 Mar 2024US 2024/0105441 A1NS Nanotech, Inc.
- Ultraviolet field-emission lamps and their applications15 Sep 2022US 2022/0293412 A1NS Nanotech, Inc.
Most cited
By later US patents
- Flat viewing screen with spacers between support plates and method of producing same81US 4,451,759 ASiemens Aktiengesellschaft · 1984
- Image display device with cathode panel and gas absorbing getters63US 5,223,766 ASony Corporation · 1993
- Electron source having planar emission region and focusing structure5US 6,815,875 B2Hewlett-Packard Development Company, L. P. · 2004
- Circuits and methods for electron-beam control4US 6,617,597 B2Hewlett-Packard Development Company, L. P. · 2003
- Ultraviolet field-emission lamps and their applications3US 10,978,290 B1NS Nanotech, Inc. · 2021