H01J 9/04
Of thermionic cathodes
Official title: of thermionic cathodes
H01J9/04 (Of thermionic cathodes) appears on 341 US grants and 172 published applications in this corpus.
Search patents in H01J- Granted patents
- 341
- Published applications
- 172
- Assignees
- 164
- Inventors
- 734
- Latest grant
- 19 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 6 | 0 |
| 1977 | 7 | 0 |
| 1978 | 7 | 0 |
| 1979 | 3 | 0 |
| 1980 | 6 | 0 |
| 1981 | 8 | 0 |
| 1982 | 4 | 0 |
| 1983 | 4 | 0 |
| 1984 | 9 | 0 |
| 1985 | 7 | 0 |
| 1986 | 5 | 0 |
| 1987 | 7 | 0 |
| 1988 | 8 | 0 |
| 1989 | 11 | 0 |
| 1990 | 9 | 0 |
| 1991 | 17 | 0 |
| 1992 | 10 | 0 |
| 1993 | 5 | 0 |
| 1994 | 9 | 0 |
| 1995 | 3 | 0 |
| 1996 | 6 | 0 |
| 1997 | 5 | 0 |
| 1998 | 10 | 0 |
| 1999 | 5 | 0 |
| 2000 | 7 | 0 |
| 2001 | 6 | 7 |
| 2002 | 10 | 10 |
| 2003 | 8 | 14 |
| 2004 | 17 | 9 |
| 2005 | 2 | 13 |
| 2006 | 8 | 6 |
| 2007 | 8 | 6 |
| 2008 | 3 | 4 |
| 2009 | 3 | 8 |
| 2010 | 5 | 7 |
| 2011 | 4 | 5 |
| 2012 | 6 | 7 |
| 2013 | 4 | 5 |
| 2014 | 4 | 6 |
| 2015 | 5 | 4 |
| 2016 | 6 | 5 |
| 2017 | 6 | 7 |
| 2018 | 7 | 5 |
| 2019 | 3 | 7 |
| 2020 | 12 | 6 |
| 2021 | 10 | 7 |
| 2022 | 7 | 4 |
| 2023 | 1 | 7 |
| 2024 | 8 | 9 |
| 2025 | 9 | 1 |
| 2026 | 1 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Electron source and method for manufacturing same, and emitter and device provided with same19 May 2026US 12,633,487 B2Denka Company Limited
- Method of manufacturing a filament, filament manufactured thereby, and x-ray tube having the filament14 Oct 2025US 12,444,565 B2Remedi Co., Ltd.
- Cathode member for electron beam generation, and method for manufacturing the same7 Oct 2025US 12,437,953 B2Kobelco Research Institute, Inc.
- Electron source, method of manufacturing the same, and electron beam apparatus using the same26 Aug 2025US 12,400,823 B2Hitachi High-Tech Corporation
- Electron source, manufacturing method therefor, and device comprising electron source6 May 2025US 12,293,893 B2Denka Company Limited
- 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
- 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.
- Cathode heater assembly and method of manfacture30 Jan 2025US 2025/0037958 A1
- Laminate, electron source and electronic device containing laminate, and production method and cleaning method for laminate28 Nov 2024US 2024/0395494 A1National Institute for Materials Science
Most cited
By later US patents
- EL sheet diaphragm and a switch using the same54US 5,871,088 AMatsushita Electric Industrial Co., Ltd. · 1999
- Miniature x-ray tube with micro cathode41US 6,987,835 B2Xoft microTube, Inc. · 2006
- Attaching self-supporting emissive film to cathode support36US 4,197,152 AGTE Sylvania Incorporated · 1980
- Cathode arrangement34US 5,343,112 ABalzers Aktiengesellschaft · 1994
- Method and apparatus for producing an electron beam from a thermionic cathode33US 4,528,474 A1985