H01J 1/22
Heaters
H01J1/22 (Heaters) appears on 55 US grants and 29 published applications in this corpus.
Search patents in H01J- Granted patents
- 55
- Published applications
- 29
- Assignees
- 39
- Inventors
- 118
- Latest grant
- 24 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 2 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 2 | 0 |
| 1993 | 0 | 0 |
| 1994 | 2 | 0 |
| 1995 | 4 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 1 | 0 |
| 1999 | 2 | 0 |
| 2000 | 1 | 0 |
| 2001 | 2 | 2 |
| 2002 | 2 | 1 |
| 2003 | 2 | 0 |
| 2004 | 0 | 2 |
| 2005 | 0 | 2 |
| 2006 | 0 | 0 |
| 2007 | 1 | 0 |
| 2008 | 1 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 3 |
| 2011 | 0 | 0 |
| 2012 | 1 | 1 |
| 2013 | 1 | 1 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 2 | 0 |
| 2017 | 1 | 1 |
| 2018 | 1 | 1 |
| 2019 | 1 | 3 |
| 2020 | 3 | 1 |
| 2021 | 2 | 1 |
| 2022 | 2 | 1 |
| 2023 | 2 | 2 |
| 2024 | 4 | 5 |
| 2025 | 2 | 2 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Emitter and device comprising same24 Mar 2026US 12,586,747 B2Denka Company Limited
- Radiotherapy device and microwave source thereof9 Sep 2025US 12,412,723 B2Shanghai United Imaging Healthcare Co., Ltd.
- Monolithic heater for thermionic electron cathode25 Feb 2025US 12,237,138 B2Applied Physics Technologies, Inc.
- Emitter and device provided with same22 Oct 2024US 12,125,663 B2Denka Company Limited
- Pincer mount cathode2 Jul 2024US 12,027,340 B2Kimball Physics, Inc.
- Radiotherapy device and microwave source thereof4 Dec 2025US 2025/0372333 A1Shanghai United Imaging Healthcare Co., Ltd.
- Emitter and device comprising same3 Jul 2025US 2025/0218717 A1Denka Company Limited
- Radiotherapy device and microwave source thereof5 Sep 2024US 2024/0297009 A1Shanghai United Imaging Healthcare Co., Ltd.
- Monolithic heater for thermionic electron cathode27 Jun 2024US 2024/0212964 A1Applied Physics Technologies, Inc.
- Pincer Mount Cathode16 May 2024US 2024/0161994 A1Kimball Physics, Inc.
Most cited
By later US patents
- Thin high temperature heater22US 5,155,340 AMitsubishi Denki Kabushiki Kaisha · 1992
- Cathode assembly, electron gun assembly, electron tube, heater, and method of manufacturing cathode assembly and electron gun assembly22US 6,130,502 AKabushiki Kaisha Toshiba · 2000
- High current density cathode structure11US 4,297,615 AThe Regents of the University of California · 1981
- Cathode heater and cathode assembly for microwave power tubes7US 5,350,969 ALitton Systems, Inc. · 1994
- Cathode ray tube having an improved indirectly heated cathode7US 6,191,528 B1Hitachi, Ltd. · 2001