H01J 25/02
Tubes with electron stream modulated in velocity or density in a modulator
Official title: Tubes with electron stream modulated in velocity or density in a modulator zone and thereafter giving up energy in an inducing zone, the zones being associated with one or more resonators
H01J25/02 (Tubes with electron stream modulated in velocity or density in a modulator) appears on 294 US grants and 116 published applications in this corpus.
Search patents in H01J- Granted patents
- 294
- Published applications
- 116
- Assignees
- 127
- Inventors
- 441
- Latest grant
- 8 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 4 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 6 | 0 |
| 1981 | 3 | 0 |
| 1982 | 4 | 0 |
| 1983 | 11 | 0 |
| 1984 | 7 | 0 |
| 1985 | 15 | 0 |
| 1986 | 12 | 0 |
| 1987 | 7 | 0 |
| 1988 | 9 | 0 |
| 1989 | 6 | 0 |
| 1990 | 6 | 0 |
| 1991 | 7 | 0 |
| 1992 | 12 | 0 |
| 1993 | 10 | 0 |
| 1994 | 10 | 0 |
| 1995 | 5 | 0 |
| 1996 | 9 | 0 |
| 1997 | 7 | 0 |
| 1998 | 10 | 0 |
| 1999 | 8 | 0 |
| 2000 | 2 | 0 |
| 2001 | 5 | 2 |
| 2002 | 5 | 5 |
| 2003 | 3 | 5 |
| 2004 | 2 | 10 |
| 2005 | 5 | 1 |
| 2006 | 6 | 5 |
| 2007 | 1 | 7 |
| 2008 | 7 | 6 |
| 2009 | 4 | 4 |
| 2010 | 7 | 7 |
| 2011 | 4 | 9 |
| 2012 | 6 | 4 |
| 2013 | 10 | 5 |
| 2014 | 7 | 6 |
| 2015 | 8 | 4 |
| 2016 | 4 | 3 |
| 2017 | 8 | 6 |
| 2018 | 1 | 3 |
| 2019 | 12 | 7 |
| 2020 | 1 | 3 |
| 2021 | 2 | 4 |
| 2022 | 3 | 0 |
| 2023 | 1 | 2 |
| 2024 | 3 | 2 |
| 2025 | 1 | 5 |
| 2026 | 2 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- H01J 25/10Klystrons, i.e. tubes having two or more resonators, without reflection of the102
- H01J 25/025With an electron stream following a helical path82
- H01J 25/04Tubes having one or more resonators, without reflection of the electron stream57
- H01J 25/22Reflex klystrons, i.e. tubes having one or more resonators, with a single7
- H01J 25/32Tubes with plural reflection7
- H01J 25/06Tubes having only one resonator, without reflection of the electron stream, and5
Recent patents
- Klystrons and medical electron linear accelerators8 Sep 2026US 12,731,751 B2Shanghai United Imaging Healthcare Co., Ltd.
- Power supply device for gyrotron and power control method1 Sep 2026US 12,725,752 B2Kyoto Fusioneering Ltd.
- Klystron device30 Sep 2025US 12,431,316 B2Canon Electron Tubes & Devices Co., Ltd.
- Hybrid Halbach permanent and electro magnet array for harmonic gyrotrons10 Dec 2024US 12,165,826 B1RCT Systems, Inc.
- Klystron25 Jun 2024US 12,020,891 B2Canon Electron Tubes & Devices Co., Ltd.
- Electromagnetic radiation generation2 Jul 2026US 2026/0188529 A1United Kingdom Atomic Energy Authority
- Klystron27 Nov 2025US 2025/0364202 A1Canon Electron Tubes & Devices Co., Ltd.
- Vacuum and High Pressure RF System for Medical Linear Accelerators20 Nov 2025US 2025/0352825 A1Varian Medical Systems, Inc.
- Power supply device for gyrotron and power control method10 Jul 2025US 2025/0226169 A1Kyoto Fusioneering Ltd.
- Travelling-Wave Tube, Electron Gun, and Power Amplification System27 Feb 2025US 2025/0070736 A1Huawei Technologies Co., Ltd.
Most cited
By later US patents
- Mode suppression means for gyrotron cavities237US 4,398,121 AVarian Associates, Inc. · 1983
- Wide-band gyrotron traveling-wave amplifier229US 4,533,875 A1985
- Mode suppressors for whispering gallery gyrotron229US 4,851,788 AVarian Associates, Inc. · 1989
- Couplers for extracting RF power from a gyrotron cavity directly into fundamental mode waveguide229US 5,015,914 AVarian Associates, Inc. · 1991
- Gyrotron having a quasi-optical mode converter225US 5,187,409 AKabushiki Kaisha Toshiba · 1993