H01J 23/04
Cathodes
H01J23/04 (Cathodes) appears on 168 US grants and 88 published applications in this corpus.
Search patents in H01J- Granted patents
- 168
- Published applications
- 88
- Assignees
- 94
- Inventors
- 345
- Latest grant
- 12 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 0 | 0 |
| 1978 | 2 | 0 |
| 1979 | 3 | 0 |
| 1980 | 2 | 0 |
| 1981 | 4 | 0 |
| 1982 | 2 | 0 |
| 1983 | 3 | 0 |
| 1984 | 4 | 0 |
| 1985 | 4 | 0 |
| 1986 | 1 | 0 |
| 1987 | 10 | 0 |
| 1988 | 4 | 0 |
| 1989 | 6 | 0 |
| 1990 | 2 | 0 |
| 1991 | 5 | 0 |
| 1992 | 7 | 0 |
| 1993 | 0 | 0 |
| 1994 | 5 | 0 |
| 1995 | 6 | 0 |
| 1996 | 4 | 0 |
| 1997 | 4 | 0 |
| 1998 | 0 | 0 |
| 1999 | 3 | 0 |
| 2000 | 1 | 0 |
| 2001 | 6 | 0 |
| 2002 | 5 | 4 |
| 2003 | 2 | 1 |
| 2004 | 2 | 4 |
| 2005 | 2 | 3 |
| 2006 | 2 | 1 |
| 2007 | 2 | 3 |
| 2008 | 2 | 5 |
| 2009 | 1 | 2 |
| 2010 | 4 | 4 |
| 2011 | 3 | 5 |
| 2012 | 4 | 5 |
| 2013 | 2 | 2 |
| 2014 | 4 | 6 |
| 2015 | 2 | 6 |
| 2016 | 4 | 2 |
| 2017 | 8 | 4 |
| 2018 | 4 | 7 |
| 2019 | 8 | 7 |
| 2020 | 4 | 2 |
| 2021 | 4 | 3 |
| 2022 | 2 | 3 |
| 2023 | 3 | 3 |
| 2024 | 3 | 1 |
| 2025 | 0 | 3 |
| 2026 | 1 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Radiotherapy device and microwave source thereof12 May 2026US 12,623,089 B2Shanghai United Imaging Healthcare Co., Ltd.
- Dielectric coated plasmonic photoemitter31 Dec 2024US 12,183,535 B2Board of Trustees of Michigan State University
- Cathode heater assembly and method of manufacture15 Oct 2024US 12,119,201 B2Elve Inc.
- Electron gun21 May 2024US 11,990,307 B2Thales Deutschland GmbH Electron Devices
- Injection-locked magnetron system based on filament injection12 Dec 2023US 11,842,878 B2Sichuan University
- Tungsten alloy wire, preparation method therefor and use thereof, and tungsten carbide alloy filament13 Aug 2026US 2026/0234761 A1Xiamen Honglu Tungsten Molybdenum Industry Co., Ltd.
- Cathode and manufacturing method thereof23 Jul 2026US 2026/0213111 A1Shanghai United Imaging Healthcare Co., Ltd.
- Control Circuit And Microwave Generation Device20 Nov 2025US 2025/0357064 A1Guangdong Midea Kitchen Appliances Manufacturing Co., Ltd.
- Travelling-Wave Tube, Electron Gun, and Power Amplification System27 Feb 2025US 2025/0070736 A1Huawei Technologies Co., Ltd.
- Cathode heater assembly and method of manfacture30 Jan 2025US 2025/0037958 A1
Most cited
By later US patents
- Article comprising enhanced nanotube emitter structure and process for fabricating article220US 6,250,984 B1Agere Systems Guardian Corp. · 2001
- Field emitting device comprising field-concentrating nanoconductor assembly and method for making the same102US 6,538,367 B1Agere Systems Inc. · 2003
- Microwave vacuum tube device employing grid-modulated cold cathode source having nanotube emitters76US 6,297,592 B1Lucent Technologies Inc. · 2001
- Magnetron with diamond coated cathode56US 6,686,696 B2Genvac Aerospace Corporation · 2004
- Cathode for a magnetron having primary and secondary electron emitters52US 6,005,347 ALG Electronics Inc. · 1999