H01J 35/065
Field emission, photo emission or secondary emission cathodes
Official title: {Field emission, photo emission or secondary emission cathodes}
H01J35/065 (Field emission, photo emission or secondary emission cathodes) appears on 322 US grants and 373 published applications in this corpus.
Search patents in H01J- Granted patents
- 322
- Published applications
- 373
- Assignees
- 174
- Inventors
- 621
- Latest grant
- 11 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 2 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 2 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 6 | 0 |
| 1996 | 1 | 0 |
| 1997 | 1 | 0 |
| 1998 | 1 | 0 |
| 1999 | 2 | 0 |
| 2000 | 1 | 0 |
| 2001 | 3 | 3 |
| 2002 | 5 | 4 |
| 2003 | 2 | 6 |
| 2004 | 2 | 8 |
| 2005 | 7 | 12 |
| 2006 | 9 | 11 |
| 2007 | 8 | 13 |
| 2008 | 8 | 9 |
| 2009 | 6 | 16 |
| 2010 | 11 | 17 |
| 2011 | 12 | 23 |
| 2012 | 11 | 11 |
| 2013 | 14 | 14 |
| 2014 | 9 | 13 |
| 2015 | 16 | 23 |
| 2016 | 12 | 14 |
| 2017 | 15 | 24 |
| 2018 | 17 | 14 |
| 2019 | 21 | 21 |
| 2020 | 29 | 29 |
| 2021 | 22 | 14 |
| 2022 | 13 | 15 |
| 2023 | 13 | 11 |
| 2024 | 14 | 18 |
| 2025 | 15 | 18 |
| 2026 | 7 | 12 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Field effect electron emitter with grouped part emission surfaces11 Aug 2026US 12,706,269 B2Siemens Healthineers AG
- Emitter and field emission assembly including the same7 Jul 2026US 12,676,276 B2AweXome Ray, Inc.
- Systems and methods for fabricating silicon die stacks for electron emitter array chips26 May 2026US 12,640,326 B2
- X-ray tube with a cooled gate electrode26 May 2026US 12,640,327 B2Siemens Healthineers AG
- X-ray apparatus, electron emission device and manufacturing method26 May 2026US 12,640,329 B2KETEK GmbH Halbleiter- und Reinraumtechnik
- X-ray devices with nanotube emitters and methods of forming8 Oct 2026US 2026/0311951 A1Varex Imaging Corporation
- Air tolerant photocathode electron gun17 Sep 2026US 2026/0276961 A1Nova Measuring Instruments Ltd.
- Electron beam emission structure and field emission device3 Sep 2026US 2026/0260836 A1Meidensha Corporation
- System and method for cathode controlled anode impact temperature27 Aug 2026US 2026/0253830 A1GE Precision Healthcare LLC
- X-ray source with multiple grids2 Jul 2026US 2026/0190208 A1Varex Imaging Corporation
Most cited
By later US patents
- X-ray source with shaped radiation pattern254US 5,422,926 APhotoelectron Corporation · 1995
- X-ray generating mechanism using electron field emission cathode190US 6,553,096 B1University of North Carolina - Chapel Hill · 2003
- X-ray source with flexible probe153US 5,428,658 APhotoelectron Corporation · 1995
- Article comprising MEMS-based two-dimensional e-beam sources and method for making the same134US 6,809,465 B2Samsung Electronics Co., Ltd. · 2004
- Field emitter based electron source with minimized beam emittance growth118US 7,801,277 B2General Electric Company · 2010