H01J 23/30
Damping arrangements associated with slow-wave structures
Official title: Damping arrangements associated with slow-wave structures, e.g. for suppression of unwanted oscillations
H01J23/30 (Damping arrangements associated with slow-wave structures) appears on 43 US grants and 5 published applications in this corpus.
Search patents in H01J- Granted patents
- 43
- Published applications
- 5
- Assignees
- 23
- Inventors
- 66
- Latest grant
- 14 Oct 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 3 | 0 |
| 1978 | 4 | 0 |
| 1979 | 4 | 0 |
| 1980 | 1 | 0 |
| 1981 | 5 | 0 |
| 1982 | 1 | 0 |
| 1983 | 2 | 0 |
| 1984 | 2 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 1 | 0 |
| 1993 | 2 | 0 |
| 1994 | 1 | 0 |
| 1995 | 3 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 1 |
| 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 | 1 |
| 2015 | 1 | 1 |
| 2016 | 1 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 1 |
| 2023 | 0 | 1 |
| 2024 | 1 | 0 |
| 2025 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Traveling wave tube14 Oct 2025US 12,444,566 B2Raytheon Company
- Travelling-wave tube26 Nov 2024US 12,154,749 B2Thales
- Traveling wave tube loaded by a material having negative permittivity and positive permeability2 Aug 2016US 9,406,477 B2Wisconsin Alumni Research Foundation
- Asymmetrical slow wave structures to eliminate backward wave oscillations in wideband traveling wave tubes1 Dec 2015US 9,202,660 B2Teledyne Wireless, LLC
- RF radiation absorbing material disposed between the cathode and anode of an electron beam tube25 Nov 1997US 5,691,667 AEnglish Electric Valve Company Limited
- Traveling wave tube26 Oct 2023US 2023/0343542 A1Raytheon Company
- Travelling-wave tube4 Aug 2022US 2022/0246381 A1Thales
- Epsilon negative loaded traveling wave tube10 Sep 2015US 2015/0256139 A1Wisconsin Alumni Research Foundation
- Asymmetrical Slow Wave Structures to Eliminate Backward Wave Oscillations in Wideband Traveling Wave Tubes18 Sep 2014US 2014/0265826 A1Teledyne Wireless, LLC
- High voltage resistance, particularly for current limitation in a microwave progressive wave tube emitter13 Sep 2001US 2001/0020890 A1Thomson-CSF
Most cited
By later US patents
- Traveling wave tube with frequency variable sever length18US 4,296,354 AVarian Associates, Inc. · 1981
- Helix traveling wave tubes with resonant loss13US 4,158,791 AVarian Associates, Inc. · 1979
- Method for bonding thermally-mismatched elements of a traveling wave tube11US 5,501,390 ALitton Systems, Inc. · 1996
- Quasi-optical component and gyrotron having undesired microwave radiation absorbing means10US 5,187,408 AAsea Brown Boveri AG · 1993
- Coupled cavity traveling wave tube having improved loss stabilization8US 4,307,322 ALitton Systems, Inc. · 1981