H01J 2201/28
Heaters for thermionic cathodes
H01J2201/28 (Heaters for thermionic cathodes) appears on 45 US grants and 40 published applications in this corpus.
Search patents in H01J- Granted patents
- 45
- Published applications
- 40
- Assignees
- 35
- Inventors
- 128
- Latest grant
- 31 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 2 | 0 |
| 1995 | 2 | 0 |
| 1996 | 0 | 0 |
| 1997 | 3 | 0 |
| 1998 | 2 | 0 |
| 1999 | 2 | 0 |
| 2000 | 2 | 0 |
| 2001 | 1 | 2 |
| 2002 | 2 | 0 |
| 2003 | 1 | 0 |
| 2004 | 0 | 1 |
| 2005 | 0 | 1 |
| 2006 | 0 | 0 |
| 2007 | 1 | 1 |
| 2008 | 0 | 0 |
| 2009 | 1 | 2 |
| 2010 | 1 | 3 |
| 2011 | 1 | 0 |
| 2012 | 1 | 2 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 3 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 1 |
| 2019 | 0 | 0 |
| 2020 | 2 | 5 |
| 2021 | 2 | 1 |
| 2022 | 2 | 4 |
| 2023 | 1 | 5 |
| 2024 | 5 | 7 |
| 2025 | 2 | 4 |
| 2026 | 5 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Mounted planar filament31 Mar 2026US 12,592,355 B2Moxtek, Inc.
- Emitter and device comprising same24 Mar 2026US 12,586,747 B2Denka Company Limited
- System and apparatus for stabilizing electron sources in charged particle systems10 Mar 2026US 12,573,580 B2ASML Netherlands B. V.
- Negative ion source and negative ion generation method24 Feb 2026US 12,558,663 B2Japan Atomic Energy Agency
- Charged particle beam source13 Jan 2026US 12,525,420 B2FEI Company
- Sintered material, method for producing same, and electron source and device provided with same13 Aug 2026US 2026/0233304 A1
- Plasma processing apparatus2 Oct 2025US 2025/0308858 A1Tokyo Electron Limited
- Emitter and device comprising same3 Jul 2025US 2025/0218717 A1Denka Company Limited
- Mounted planar filament6 Mar 2025US 2025/0079108 A1Moxtek, Inc.
- Cathode heater assembly and method of manfacture30 Jan 2025US 2025/0037958 A1
Most cited
By later US patents
- Cathode43US 5,475,281 AU. S. Philips Corporation · 1995
- Method for manufacturing a cathode38US 5,595,933 AU. S. Philips Corporation · 1997
- Method for depositing cathode material on a wire cathode23US 5,714,051 AU. S. Philips Corporation · 1998
- 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