H01J 1/312
Having an electric field perpendicular to the surface
Official title: having an electric field perpendicular to the surface, e.g. tunnel-effect cathodes of metal-insulator-metal [MIM] type {(H01J1/304- H01J1/308 take precedence)}
H01J1/312 (Having an electric field perpendicular to the surface) appears on 178 US grants and 167 published applications in this corpus.
Search patents in H01J- Granted patents
- 178
- Published applications
- 167
- Assignees
- 58
- Inventors
- 276
- Latest grant
- 8 Apr 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 2 | 0 |
| 1994 | 4 | 0 |
| 1995 | 1 | 0 |
| 1996 | 2 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 7 | 0 |
| 2000 | 9 | 0 |
| 2001 | 9 | 3 |
| 2002 | 6 | 5 |
| 2003 | 11 | 23 |
| 2004 | 21 | 25 |
| 2005 | 21 | 21 |
| 2006 | 11 | 23 |
| 2007 | 10 | 15 |
| 2008 | 4 | 8 |
| 2009 | 7 | 6 |
| 2010 | 10 | 10 |
| 2011 | 4 | 4 |
| 2012 | 4 | 2 |
| 2013 | 7 | 4 |
| 2014 | 4 | 1 |
| 2015 | 1 | 6 |
| 2016 | 7 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 1 |
| 2019 | 0 | 2 |
| 2020 | 4 | 1 |
| 2021 | 0 | 1 |
| 2022 | 2 | 3 |
| 2023 | 2 | 2 |
| 2024 | 2 | 0 |
| 2025 | 1 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Ionization detector and detection method8 Apr 2025US 12,272,512 B2KETEK GmbH Halbleiter- und Reinraumtechnik
- Electron emission device and electron microscope30 Jul 2024US 12,051,557 B2National Institute of Advanced Industrial Science and Technology
- Electron emitting element and method for manufacturing same30 Jan 2024US 11,887,802 B2National Institute of Advanced Industrial Science and Technology
- Electron emitting element and power generation element30 May 2023US 11,664,182 B2Kabushiki Kaisha Toshiba
- Electron emitting element10 Jan 2023US 11,551,902 B2Sharp Kabushiki Kaisha
- Field emission device, and x-ray generation device using same27 Nov 2025US 2025/0364204 A1LG Electronics Inc.
- Ionization Detector and Detection Method16 Nov 2023US 2023/0369001 A1KETEK GmbH Halbleiter- und Reinraumtechnik
- Electron emitting element and method for manufacturing same4 May 2023US 2023/0134647 A1National Institute of Advanced Industrial Science and Technology
- Electron emission device and electron microscope7 Jul 2022US 2022/0216026 A1National Institute of Advanced Industrial Science and Technology
- Electron emitting element and power generation element5 May 2022US 2022/0139660 A1Kabushiki Kaisha Toshiba
Most cited
By later US patents
- Electron emission device and display device using the same69US 5,990,605 APioneer Electronic Corporation · 1999
- Electron emission device and display device for emitting electrons in response to an applied electric field using the electron emission device57US 5,962,959 APioneer Electronic Corporation · 1999
- Electron emission device and display using the same54US 6,130,503 APioneer Electronic Corporation · 2000
- Display system utilizing electron emission by polarization reversal of ferroelectric material53US 5,631,664 AOlympus Optical Co., Ltd. · 1997
- Emitter and method of making51US 7,118,982 B2Hewlett-Packard Development Company, L. P. · 2006