H01J 1/025
Hollow cathodes
Official title: {Hollow cathodes}
H01J1/025 (Hollow cathodes) appears on 58 US grants and 36 published applications in this corpus.
Search patents in H01J- Granted patents
- 58
- Published applications
- 36
- Assignees
- 39
- Inventors
- 106
- Latest grant
- 8 Apr 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 2 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 3 | 0 |
| 2001 | 2 | 1 |
| 2002 | 3 | 1 |
| 2003 | 2 | 2 |
| 2004 | 4 | 3 |
| 2005 | 2 | 3 |
| 2006 | 1 | 3 |
| 2007 | 1 | 1 |
| 2008 | 0 | 2 |
| 2009 | 3 | 3 |
| 2010 | 2 | 0 |
| 2011 | 1 | 0 |
| 2012 | 2 | 1 |
| 2013 | 1 | 0 |
| 2014 | 0 | 1 |
| 2015 | 1 | 1 |
| 2016 | 4 | 3 |
| 2017 | 3 | 0 |
| 2018 | 2 | 0 |
| 2019 | 0 | 1 |
| 2020 | 0 | 0 |
| 2021 | 1 | 6 |
| 2022 | 4 | 2 |
| 2023 | 2 | 0 |
| 2024 | 1 | 1 |
| 2025 | 3 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Electron gun8 Apr 2025US 12,272,514 B2Shanghai United Imaging Healthcare Co., Ltd.
- Method and apparatus for reducing the work function of polycrystalline metal hexaboride25 Feb 2025US 12,237,137 B2California Institute of Technology
- Charge carrier generation source28 Jan 2025US 12,211,663 B2Scia Systems GmbH
- Microplasma-based heaterless, insertless cathode3 Sep 2024US 12,078,154 B1Board of Trustees of the University of Alabama, for and on behalf of the University of Alabama in Huntsville
- Hollow cathode, an apparatus including a hollow cathode for manufacturing a semiconductor device, and a method of manufacturing a semiconductor device using a hollow cathode24 Oct 2023US 11,798,788 B2Samsung Electronics Co., Ltd.
- Electron gun17 Jul 2025US 2025/0232940 A1Shanghai United Imaging Healthcare Co., Ltd.
- Electron gun4 Jan 2024US 2024/0006142 A1Shanghai United Imaging Healthcare Co., Ltd.
- Charge carrier generation source22 Dec 2022US 2022/0406559 A1Scia Systems GmbH
- Method and apparatus for reducing the work function of polycrystalline metal hexaboride13 Oct 2022US 2022/0328274 A1California Institute of Technology
- Stepped indirectly heated cathode with improved shielding23 Dec 2021US 2021/0398765 A1Axcelis Technologies, Inc.
Most cited
By later US patents
- Discharge device having cathode with micro hollow array70US 5,686,789 AOsram Sylvania Inc. · 1997
- Discharge device having cathode with micro hollow array60US 5,939,829 AOsram Sylvania Inc. · 1999
- Hollow cathode37US 4,633,129 AInternational Business Machines Corporation · 1986
- Discharge apparatus having hollow cathode33US 4,339,691 ATokyo Shibaura Denki Kabushiki Kaisha · 1982
- Compact high current rare-earth emitter hollow cathode for hall effect thrusters32US 8,143,788 B2California Institute of Technology · 2012