H01J 1/20
Cathodes heated indirectly by an electric current
Official title: Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment
H01J1/20 (Cathodes heated indirectly by an electric current) appears on 294 US grants and 115 published applications in this corpus.
Search patents in H01J- Granted patents
- 294
- Published applications
- 115
- Assignees
- 123
- Inventors
- 516
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 2 | 0 |
| 1978 | 5 | 0 |
| 1979 | 9 | 0 |
| 1980 | 3 | 0 |
| 1981 | 6 | 0 |
| 1982 | 5 | 0 |
| 1983 | 6 | 0 |
| 1984 | 2 | 0 |
| 1985 | 7 | 0 |
| 1986 | 4 | 0 |
| 1987 | 2 | 0 |
| 1988 | 4 | 0 |
| 1989 | 8 | 0 |
| 1990 | 11 | 0 |
| 1991 | 16 | 0 |
| 1992 | 14 | 0 |
| 1993 | 7 | 0 |
| 1994 | 12 | 0 |
| 1995 | 12 | 0 |
| 1996 | 6 | 0 |
| 1997 | 7 | 0 |
| 1998 | 11 | 0 |
| 1999 | 9 | 0 |
| 2000 | 8 | 0 |
| 2001 | 9 | 5 |
| 2002 | 12 | 8 |
| 2003 | 5 | 12 |
| 2004 | 11 | 11 |
| 2005 | 5 | 7 |
| 2006 | 5 | 8 |
| 2007 | 5 | 1 |
| 2008 | 6 | 0 |
| 2009 | 1 | 4 |
| 2010 | 1 | 8 |
| 2011 | 2 | 2 |
| 2012 | 4 | 1 |
| 2013 | 3 | 2 |
| 2014 | 2 | 2 |
| 2015 | 1 | 3 |
| 2016 | 4 | 2 |
| 2017 | 2 | 3 |
| 2018 | 1 | 3 |
| 2019 | 2 | 5 |
| 2020 | 8 | 4 |
| 2021 | 7 | 4 |
| 2022 | 3 | 3 |
| 2023 | 3 | 4 |
| 2024 | 11 | 8 |
| 2025 | 2 | 4 |
| 2026 | 2 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- X-ray tube22 Sep 2026US 12,744,177 B2Hamamatsu Photonics K.K.
- 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.
- X-ray cathode focusing element31 Dec 2024US 12,183,536 B2GE Precision Healthcare LLC
- Ion source cathode with monolithic radiation shields30 Jul 2026US 2026/0221371 A1Axcelis Technologies, Inc.
- Radiotherapy device and microwave source thereof4 Dec 2025US 2025/0372333 A1Shanghai United Imaging Healthcare Co., Ltd.
- X-ray tube6 Nov 2025US 2025/0343020 A1Hamamatsu Photonics K.K.
- Emitter and device comprising same3 Jul 2025US 2025/0218717 A1Denka Company Limited
- Fixed position filament15 May 2025US 2025/0157775 A1Axcelis Technologies, Inc.
Most cited
By later US patents
- Display apparatus for displaying pictures virtually instantaneously96US 5,424,620 ASamsung Electronics Co., Ltd. · 1995
- Cathode43US 5,475,281 AU. S. Philips Corporation · 1995
- Method for manufacturing a cathode38US 5,595,933 AU. S. Philips Corporation · 1997
- Electron tube with dispenser cathode27US 4,165,473 AVarian Associates, Inc. · 1979
- Impregnated cathode26US 4,518,890 AHitachi, Ltd. · 1985