H01J 2225/00
Transit-time tubes
Official title: Transit-time tubes, e.g. Klystrons, travelling-wave tubes, magnetrons
H01J2225/00 (Transit-time tubes) appears on 94 US grants and 22 published applications in this corpus.
Search patents in H01J- Granted patents
- 94
- Published applications
- 22
- Assignees
- 51
- Inventors
- 160
- Latest grant
- 8 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1994 | 6 | 0 |
| 1995 | 12 | 0 |
| 1996 | 5 | 0 |
| 1997 | 12 | 0 |
| 1998 | 7 | 0 |
| 1999 | 10 | 0 |
| 2000 | 3 | 0 |
| 2001 | 9 | 2 |
| 2002 | 7 | 7 |
| 2003 | 7 | 6 |
| 2004 | 7 | 1 |
| 2005 | 5 | 1 |
| 2006 | 2 | 3 |
| 2007 | 0 | 1 |
| 2008 | 0 | 0 |
| 2009 | 1 | 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 | 0 | 0 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- H01J 2225/02Tubes with electron stream modulated in velocity or density in a modulatorIndexing code39
- H01J 2225/50Magnetrons, i.e. tubes with a magnet system producing an h-field crossing theIndexing code34
- H01J 2225/34Travelling-wave tubesIndexing code22
- H01J 2225/005Gas-filled transit-time tubesIndexing code0
- H01J 2225/61Hybrid tubes, i.e. tubes comprising a klystron section and a travelling-wave sectionIndexing code0
- H01J 2225/62Strophotrons, i.e. tubes with h-field crossing the e-field and functioning with pluralIndexing code0
- H01J 2225/64Turbine tubes, i.e. tubes with h-field crossing the e-field and functioning withIndexing code0
- H01J 2225/66Tubes with electron stream crossing itself and thereby interacting or interfering withIndexing code0
All 12 subgroupsShow fewer
- H01J 2225/68Tubes specially designed to act as oscillator with positive grid and retardingIndexing code0
- H01J 2225/74Tubes specially designed to act as transit-time diode oscillatorsIndexing code0
- H01J 2225/76Dynamic electron-multiplier tubesIndexing code0
- H01J 2225/78Tubes with electron stream modulated by deflection in a resonatorIndexing code0
Recent patents
- Klystrons and medical electron linear accelerators8 Sep 2026US 12,731,751 B2Shanghai United Imaging Healthcare Co., Ltd.
- Electron beam tubes13 Jan 2009US 7,477,019 B2E2VV Technologies (UK) Limited
- L-band inductive output tube5 Dec 2006US 7,145,297 B2Communications & Power Industries, Inc.
- Power supply apparatus for traveling-wave tube which eliminates high voltage relay25 Apr 2006US 7,034,472 B2NEC Microwave Tube, Ltd.
- Multi-stage collector having electrode stages isolated by a distributed bypass capacitor12 Apr 2005US 6,879,208 B2Marconi Applied Technologies Limited
- Klystrons and medical electron linear accelerators10 Oct 2024US 2024/0339281 A1Shanghai United Imaging Healthcare Co., Ltd.
- L-band inductive output tube12 Apr 2007US 2007/0080762 A1Communications & Power Industries, Inc.
- Electron bean tubes13 Jul 2006US 2006/0152176 A1E2V Technologies (UK) Limited
- Electron gun4 May 2006US 2006/0091776 A1NEC Microwave Tube, Ltd.
- L-band inductive output tube4 May 2006US 2006/0091831 A1Communications and Power Industries, Inc., a Delaware Corporation
Most cited
By later US patents
- Quasi-optical coupler with reduced diffraction229US 5,652,554 AThomson Tubes Electroniques · 1997
- Field emitting device comprising field-concentrating nanoconductor assembly and method for making the same102US 6,538,367 B1Agere Systems Inc. · 2003
- Multi-stage depressed collector for small orbit gyrotrons39US 5,780,970 ACalabazas Creek Research Center, Inc. · 1998
- Microwave oven and magnetron with cold cathode14US 5,676,873 ASharp Kabushiki Kaisha · 1997
- Field-emission cold-cathode electron gun having emitter tips between the top surface of gate electrode and focusing electrode14US 5,986,388 ANEC Corporation · 1999