H01J 25/34
Travelling-wave tubes
Official title: Travelling-wave tubes; Tubes in which a travelling wave is simulated at spaced gaps
H01J25/34 (Travelling-wave tubes) appears on 180 US grants and 109 published applications in this corpus.
Search patents in H01J- Granted patents
- 180
- Published applications
- 109
- Assignees
- 89
- Inventors
- 302
- Latest grant
- 4 Nov 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 5 | 0 |
| 1977 | 1 | 0 |
| 1978 | 5 | 0 |
| 1979 | 3 | 0 |
| 1980 | 4 | 0 |
| 1981 | 3 | 0 |
| 1982 | 0 | 0 |
| 1983 | 5 | 0 |
| 1984 | 0 | 0 |
| 1985 | 2 | 0 |
| 1986 | 4 | 0 |
| 1987 | 1 | 0 |
| 1988 | 3 | 0 |
| 1989 | 5 | 0 |
| 1990 | 3 | 0 |
| 1991 | 1 | 0 |
| 1992 | 2 | 0 |
| 1993 | 3 | 0 |
| 1994 | 2 | 0 |
| 1995 | 2 | 0 |
| 1996 | 5 | 0 |
| 1997 | 4 | 0 |
| 1998 | 2 | 0 |
| 1999 | 4 | 0 |
| 2000 | 3 | 0 |
| 2001 | 1 | 1 |
| 2002 | 5 | 2 |
| 2003 | 4 | 3 |
| 2004 | 2 | 1 |
| 2005 | 2 | 5 |
| 2006 | 5 | 6 |
| 2007 | 3 | 3 |
| 2008 | 0 | 5 |
| 2009 | 5 | 5 |
| 2010 | 3 | 3 |
| 2011 | 3 | 7 |
| 2012 | 6 | 13 |
| 2013 | 3 | 1 |
| 2014 | 14 | 6 |
| 2015 | 9 | 2 |
| 2016 | 3 | 4 |
| 2017 | 3 | 3 |
| 2018 | 4 | 1 |
| 2019 | 4 | 4 |
| 2020 | 4 | 4 |
| 2021 | 4 | 6 |
| 2022 | 2 | 5 |
| 2023 | 6 | 5 |
| 2024 | 9 | 3 |
| 2025 | 4 | 5 |
| 2026 | 0 | 6 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
- H01J 25/36Tubes in which an electron stream interacts with a wave travelling along62
- H01J 25/42Tubes in which an electron stream interacts with a wave travelling along47
- H01J 25/48Tubes in which two electron streams of different velocities interact with one1
- H01J 25/49Tubes using the parametric principle1
Recent patents
- Magneto-electrostatic sensing, focusing, and steering of electron beams in vacuum electron devices4 Nov 2025US 12,463,000 B2Elve Inc.
- Traveling wave tube14 Oct 2025US 12,444,566 B2Raytheon Company
- Lightweight, thermally stable disk for a coaxial travelling wave tube (CoTWT)15 Apr 2025US 12,278,079 B1Raytheon Company
- Multi-layer vacuum electron device and method of manufacture4 Feb 2025US 12,217,926 B2Elve Inc.
- Dielectric coated plasmonic photoemitter31 Dec 2024US 12,183,535 B2Board of Trustees of Michigan State University
- Electromagnetic radiation generation2 Jul 2026US 2026/0188529 A1United Kingdom Atomic Energy Authority
- Observation unit, traveling wave tube unit, microwave tube unit, and observation method11 Jun 2026US 2026/0162922 A1NEC Network and Sensor Systems, Ltd.
- Insulative assemblies, microwave vacuum tube assemblies and radiotherapy machines including the same23 Apr 2026US 2026/0108764 A1Varian Medical Systems, Inc.
- Collector for a traveling wave tube and traveling wave tube with such a collector9 Apr 2026US 2026/0100322 A1Thales Deutschland GmbH
- Magneto-electrostatic sensing, focusing, and steering of electron beams in vacuum electron devices5 Feb 2026US 2026/0038760 A1Elve Inc.
Most cited
By later US patents
- High voltage power supply particularly adapted for a TWT39US 4,777,406 AVarian Associates, Inc. · 1988
- Gigatron microwave amplifier28US 5,227,701 A1993
- High voltage power supply for a microwave electron tube27US 4,866,344 AVarian Associates, Inc. · 1989
- Triangular section permanent magnetic structure26US 5,014,028 AThe United States of America as represented by the Secretary of the Army · 1991
- Millimeter and sub-millimeter radiation source16US 4,298,824 ADartmouth College · 1981