H01J 23/54
Filtering devices preventing unwanted frequencies or modes to be coupled to, or
Official title: Filtering devices preventing unwanted frequencies or modes to be coupled to, or out of, the interaction circuit; Prevention of high frequency leakage in the environment
H01J23/54 (Filtering devices preventing unwanted frequencies or modes to be coupled to, or) appears on 63 US grants and 31 published applications in this corpus.
Search patents in H01J- Granted patents
- 63
- Published applications
- 31
- Assignees
- 44
- Inventors
- 109
- Latest grant
- 17 Jun 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 2 | 0 |
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 2 | 0 |
| 1992 | 1 | 0 |
| 1993 | 4 | 0 |
| 1994 | 0 | 0 |
| 1995 | 2 | 0 |
| 1996 | 5 | 0 |
| 1997 | 1 | 0 |
| 1998 | 2 | 0 |
| 1999 | 4 | 0 |
| 2000 | 2 | 0 |
| 2001 | 2 | 2 |
| 2002 | 6 | 3 |
| 2003 | 3 | 5 |
| 2004 | 3 | 4 |
| 2005 | 1 | 0 |
| 2006 | 4 | 2 |
| 2007 | 1 | 3 |
| 2008 | 1 | 0 |
| 2009 | 1 | 0 |
| 2010 | 1 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 1 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 1 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 1 |
| 2019 | 4 | 4 |
| 2020 | 0 | 1 |
| 2021 | 1 | 0 |
| 2022 | 0 | 1 |
| 2023 | 2 | 2 |
| 2024 | 0 | 0 |
| 2025 | 1 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Semi-transparent detector array and spatially tunable filter array17 Jun 2025US 12,332,422 B2L3Harris Technologies, Inc.
- Injection-locked magnetron system based on filament injection12 Dec 2023US 11,842,878 B2Sichuan University
- Magnetron filter board for microwave oven21 Mar 2023US 11,612,022 B2Rockwell Collins, Inc.
- Adapting circuit for driving a magnetron with multiple switching power supplies27 Jul 2021US 11,076,456 B2
- Sheet beam klystron (SBK) amplifiers with wrap-on solenoid for stable operation26 Nov 2019US 10,490,381 B2Qmast LLC
- Semi-transparent detector array and spatially tunable filter array11 Sep 2025US 2025/0284111 A1L3Harris Technologies, Inc.
- Semi-transparent detector array and spatially tunable filter array28 Sep 2023US 2023/0305285 A1L3Harris Technologies, Inc.
- Injection-locked magnetron system based on filament injection15 Jun 2023US 2023/0187164 A1Sichuan University
- Microwave Oven9 Jun 2022US 2022/0183120 A1Guandong Midea White Home Appliance Technology Innovation Center Co., Ltd.
- Adapting circuit for driving a magnetron with multiple switching power supplies4 Jun 2020US 2020/0178359 A1
Most cited
By later US patents
- Inductive output tube (IOT) amplifier system26US 6,232,721 B1Harris Corporation · 2001
- Magnetron with harmonic suppression means12US 5,049,782 ASanyo Electric Co., Ltd. · 1991
- Tubular capacitor for use in an electron beam tube12US 6,781,313 B2Marconi Applied Technologies Limited · 2004
- Magnetron11US 4,742,272 AHitachi Device Eng. Co., Ltd. · 1988
- Magnetron having coaxial choke means extending into the output side insulating tube space11US 5,180,946 ASanyo Electric Co., Ltd. · 1993