H01J 25/20
Having special arrangements in the space between resonators
Official title: having special arrangements in the space between resonators, e.g. resistive-wall amplifier tube, space-charge amplifier tube, velocity-jump tube
H01J25/20 (Having special arrangements in the space between resonators) appears on 5 US grants and 1 published applications in this corpus.
Search patents in H01J- Granted patents
- 5
- Published applications
- 1
- Assignees
- 4
- Inventors
- 7
- Latest grant
- 30 Sep 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 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 | 0 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 0 |
| 2023 | 0 | 0 |
| 2024 | 0 | 1 |
| 2025 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Klystron device30 Sep 2025US 12,431,316 B2Canon Electron Tubes & Devices Co., Ltd.
- Method for suppressing second and higher harmonic power generation in klystrons28 May 1996US 5,521,551 A
- Plasma klystron amplifier31 Jan 1995US 5,386,177 AThe United States of America as represented by the Secretary of the Navy
- Klystron having a vacuum gate valve disposed in a drift tube21 Jun 1994US 5,323,086 AMitsubishi Denki Kabushiki Kaisha
- Microwave amplifier tube having two ring resonators2 Apr 1985US 4,508,992 AU. S. Philips Corporation
Most cited
By later US patents
- Plasma klystron amplifier9US 5,386,177 AThe United States of America as represented by the Secretary of the Navy · 1995
- Microwave amplifier tube having two ring resonators5US 4,508,992 AU. S. Philips Corporation · 1985
- Klystron having a vacuum gate valve disposed in a drift tube1US 5,323,086 AMitsubishi Denki Kabushiki Kaisha · 1994
- Method for suppressing second and higher harmonic power generation in klystrons1US 5,521,551 A1996