H01J 23/05
Having a cylindrical emissive surface
Official title: having a cylindrical emissive surface, e.g. cathodes for magnetrons
H01J23/05 (Having a cylindrical emissive surface) appears on 90 US grants and 44 published applications in this corpus.
Search patents in H01J- Granted patents
- 90
- Published applications
- 44
- Assignees
- 54
- Inventors
- 179
- Latest grant
- 12 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 0 | 0 |
| 1978 | 1 | 0 |
| 1979 | 2 | 0 |
| 1980 | 2 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 4 | 0 |
| 1985 | 3 | 0 |
| 1986 | 0 | 0 |
| 1987 | 5 | 0 |
| 1988 | 2 | 0 |
| 1989 | 3 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 4 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 5 | 0 |
| 1996 | 4 | 0 |
| 1997 | 3 | 0 |
| 1998 | 0 | 0 |
| 1999 | 3 | 0 |
| 2000 | 0 | 0 |
| 2001 | 2 | 0 |
| 2002 | 3 | 2 |
| 2003 | 1 | 0 |
| 2004 | 1 | 2 |
| 2005 | 0 | 3 |
| 2006 | 2 | 0 |
| 2007 | 2 | 2 |
| 2008 | 0 | 2 |
| 2009 | 1 | 1 |
| 2010 | 1 | 2 |
| 2011 | 2 | 4 |
| 2012 | 3 | 3 |
| 2013 | 1 | 2 |
| 2014 | 3 | 3 |
| 2015 | 2 | 4 |
| 2016 | 1 | 1 |
| 2017 | 4 | 1 |
| 2018 | 1 | 2 |
| 2019 | 4 | 2 |
| 2020 | 1 | 1 |
| 2021 | 2 | 1 |
| 2022 | 2 | 3 |
| 2023 | 2 | 1 |
| 2024 | 0 | 0 |
| 2025 | 0 | 1 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Radiotherapy device and microwave source thereof12 May 2026US 12,623,089 B2Shanghai United Imaging Healthcare Co., Ltd.
- Injection-locked magnetron system based on filament injection12 Dec 2023US 11,842,878 B2Sichuan University
- Multi-cathode magnetron with internal electromagnetic field coupling24 Jan 2023US 11,562,873 B2Tsinghua University
- Electron gun and manufacturing method therefor6 Sep 2022US 11,437,214 B2New Japan Radio Co., Ltd.
- Electron-emitting electrode including multiple diamond members and magnetron including same12 Jul 2022US 11,387,069 B2Kabushiki Kaisha Toshiba
- 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.
- Control Circuit And Microwave Generation Device20 Nov 2025US 2025/0357064 A1Guangdong Midea Kitchen Appliances Manufacturing Co., Ltd.
- Injection-locked magnetron system based on filament injection15 Jun 2023US 2023/0187164 A1Sichuan University
- Radiotherapy device and microwave source thereof6 Oct 2022US 2022/0314018 A1Shanghai United Imaging Healthcare Co., Ltd.
- Electron-emitting electrode including multiple diamond members and magnetron including same9 Jun 2022US 2022/0181112 A1Kabushiki Kaisha Toshiba
Most cited
By later US patents
- 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
- Magnetron with a ceramic stem having a cathode support structure17US 4,705,989 AKabushiki Kaisha Toshiba · 1987
- Magnetron with improved mode separation16US 5,635,797 AHitachi Device Engineering Co., Ltd. · 1997
- Grid coating for thermionic electron emission suppression13US 4,263,528 AVarian Associates, Inc. · 1981