H01J 1/28
Dispenser-type cathodes
Official title: Dispenser-type cathodes, e.g. L-cathode
H01J1/28 (Dispenser-type cathodes) appears on 115 US grants and 27 published applications in this corpus.
Search patents in H01J- Granted patents
- 115
- Published applications
- 27
- Assignees
- 48
- Inventors
- 197
- Latest grant
- 21 May 2024
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 2 | 0 |
| 1978 | 1 | 0 |
| 1979 | 2 | 0 |
| 1980 | 1 | 0 |
| 1981 | 3 | 0 |
| 1982 | 3 | 0 |
| 1983 | 3 | 0 |
| 1984 | 0 | 0 |
| 1985 | 4 | 0 |
| 1986 | 3 | 0 |
| 1987 | 2 | 0 |
| 1988 | 3 | 0 |
| 1989 | 5 | 0 |
| 1990 | 6 | 0 |
| 1991 | 9 | 0 |
| 1992 | 7 | 0 |
| 1993 | 4 | 0 |
| 1994 | 5 | 0 |
| 1995 | 4 | 0 |
| 1996 | 1 | 0 |
| 1997 | 5 | 0 |
| 1998 | 5 | 0 |
| 1999 | 4 | 0 |
| 2000 | 2 | 0 |
| 2001 | 4 | 1 |
| 2002 | 5 | 0 |
| 2003 | 0 | 4 |
| 2004 | 2 | 1 |
| 2005 | 1 | 1 |
| 2006 | 0 | 1 |
| 2007 | 1 | 1 |
| 2008 | 1 | 0 |
| 2009 | 0 | 2 |
| 2010 | 1 | 2 |
| 2011 | 0 | 1 |
| 2012 | 3 | 0 |
| 2013 | 0 | 0 |
| 2014 | 1 | 1 |
| 2015 | 0 | 3 |
| 2016 | 2 | 2 |
| 2017 | 1 | 1 |
| 2018 | 0 | 2 |
| 2019 | 1 | 0 |
| 2020 | 3 | 2 |
| 2021 | 2 | 1 |
| 2022 | 1 | 0 |
| 2023 | 1 | 1 |
| 2024 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Electron gun21 May 2024US 11,990,307 B2Thales Deutschland GmbH Electron Devices
- Electron source19 Sep 2023US 11,764,026 B2Isotopx Ltd
- Electron source30 Aug 2022US 11,430,627 B2Isotopx Ltd
- Thermionic tungsten/scandate cathodes and method of making the same27 Jul 2021US 11,075,049 B2The Government of the United States of America, as represented by the Secretary of the Navy
- Magnetron18 May 2021US 11,011,339 B2
- Electron source26 Jan 2023US 2023/0028580 A1Isotopx Ltd
- Electron gun11 Nov 2021US 2021/0350995 A1Thales Deutschland GmbH Electron Devices
- An electron source17 Sep 2020US 2020/0294751 A1Isotopx Ltd
- Thermionic Tungsten/Scandate Cathodes and Method of Making The Same6 Feb 2020US 2020/0043691 A1The Government of the United States of America, as represented by the Secretary of the Navy
- Low work function electron beam filament assembly20 Sep 2018US 2018/0269024 A1Colorado State University Research Foundation
Most cited
By later US patents
- Display apparatus for displaying pictures virtually instantaneously96US 5,424,620 ASamsung Electronics Co., Ltd. · 1995
- Electron tube with dispenser cathode27US 4,165,473 AVarian Associates, Inc. · 1979
- Impregnated cathode26US 4,518,890 AHitachi, Ltd. · 1985
- Dispenser cathode with emitting surface parallel to ion flow25US 5,063,324 AITT Corporation · 1991
- Dispenser cathode and method of manufacture therefor22US 4,823,044 ACeradyne, Inc. · 1989