H01J 1/13
Solid thermionic cathodes
H01J1/13 (Solid thermionic cathodes) appears on 758 US grants and 357 published applications in this corpus.
Search patents in H01J- Granted patents
- 758
- Published applications
- 357
- Assignees
- 281
- Inventors
- 1,303
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 6 | 0 |
| 1977 | 7 | 0 |
| 1978 | 12 | 0 |
| 1979 | 15 | 0 |
| 1980 | 13 | 0 |
| 1981 | 18 | 0 |
| 1982 | 14 | 0 |
| 1983 | 17 | 0 |
| 1984 | 18 | 0 |
| 1985 | 14 | 0 |
| 1986 | 10 | 0 |
| 1987 | 12 | 0 |
| 1988 | 11 | 0 |
| 1989 | 17 | 0 |
| 1990 | 19 | 0 |
| 1991 | 27 | 0 |
| 1992 | 24 | 0 |
| 1993 | 18 | 0 |
| 1994 | 17 | 0 |
| 1995 | 14 | 0 |
| 1996 | 13 | 0 |
| 1997 | 17 | 0 |
| 1998 | 29 | 0 |
| 1999 | 18 | 0 |
| 2000 | 20 | 0 |
| 2001 | 15 | 7 |
| 2002 | 25 | 20 |
| 2003 | 22 | 27 |
| 2004 | 25 | 20 |
| 2005 | 13 | 15 |
| 2006 | 10 | 13 |
| 2007 | 11 | 6 |
| 2008 | 10 | 9 |
| 2009 | 5 | 24 |
| 2010 | 9 | 24 |
| 2011 | 15 | 11 |
| 2012 | 16 | 9 |
| 2013 | 12 | 16 |
| 2014 | 12 | 12 |
| 2015 | 7 | 13 |
| 2016 | 17 | 10 |
| 2017 | 13 | 13 |
| 2018 | 13 | 9 |
| 2019 | 8 | 14 |
| 2020 | 24 | 12 |
| 2021 | 19 | 17 |
| 2022 | 9 | 10 |
| 2023 | 7 | 13 |
| 2024 | 19 | 18 |
| 2025 | 13 | 11 |
| 2026 | 9 | 4 |
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.
- Electron gun using virtual source method23 Jun 2026US 12,665,154 B2Korea Research Institute of Standards and Science
- Flat emitter with compliant supported end16 Jun 2026US 12,653,467 B2GE Precision Healthcare LLC
- Electron source and method for manufacturing same, and emitter and device provided with same19 May 2026US 12,633,487 B2Denka Company Limited
- Mounted planar filament31 Mar 2026US 12,592,355 B2Moxtek, Inc.
- Preparation method of tungsten-rhenium-based diffusion-type thermionic cathode material containing low melting point barium calcium aluminate salt24 Sep 2026US 2026/0290736 A1Beijing University of Technology
- Sintered material, method for producing same, and electron source and device provided with same13 Aug 2026US 2026/0233304 A1
- Ion source cathode with monolithic radiation shields30 Jul 2026US 2026/0221371 A1Axcelis Technologies, Inc.
- Cathode and manufacturing method thereof23 Jul 2026US 2026/0213111 A1Shanghai United Imaging Healthcare Co., Ltd.
- Radiotherapy device and microwave source thereof4 Dec 2025US 2025/0372333 A1Shanghai United Imaging Healthcare Co., Ltd.
Most cited
By later US patents
- Carbon nanotube device, manufacturing method of carbon nanotube device, and electron emitting device135US 6,628,053 B1Canon Kabushiki Kaisha · 2003
- Display apparatus for displaying pictures virtually instantaneously96US 5,424,620 ASamsung Electronics Co., Ltd. · 1995
- Electronic fluorescent display60US 5,229,691 APanocorp Display Systems · 1993
- Electronic fluorescent display54US 5,565,742 APanocorp Display Systems · 1996
- EL sheet diaphragm and a switch using the same54US 5,871,088 AMatsushita Electric Industrial Co., Ltd. · 1999