H01J 29/04
Cathodes
H01J29/04 (Cathodes) appears on 364 US grants and 301 published applications in this corpus.
Search patents in H01J- Granted patents
- 364
- Published applications
- 301
- Assignees
- 136
- Inventors
- 725
- Latest grant
- 28 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 7 | 0 |
| 1977 | 5 | 0 |
| 1978 | 10 | 0 |
| 1979 | 6 | 0 |
| 1980 | 3 | 0 |
| 1981 | 6 | 0 |
| 1982 | 4 | 0 |
| 1983 | 1 | 0 |
| 1984 | 3 | 0 |
| 1985 | 8 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 4 | 0 |
| 1989 | 3 | 0 |
| 1990 | 2 | 0 |
| 1991 | 5 | 0 |
| 1992 | 5 | 0 |
| 1993 | 3 | 0 |
| 1994 | 4 | 0 |
| 1995 | 6 | 0 |
| 1996 | 9 | 0 |
| 1997 | 4 | 0 |
| 1998 | 10 | 0 |
| 1999 | 12 | 0 |
| 2000 | 10 | 0 |
| 2001 | 12 | 1 |
| 2002 | 4 | 12 |
| 2003 | 9 | 13 |
| 2004 | 8 | 13 |
| 2005 | 8 | 18 |
| 2006 | 9 | 25 |
| 2007 | 11 | 34 |
| 2008 | 16 | 46 |
| 2009 | 13 | 35 |
| 2010 | 27 | 24 |
| 2011 | 25 | 18 |
| 2012 | 26 | 11 |
| 2013 | 14 | 6 |
| 2014 | 6 | 4 |
| 2015 | 3 | 8 |
| 2016 | 7 | 3 |
| 2017 | 4 | 2 |
| 2018 | 6 | 4 |
| 2019 | 2 | 5 |
| 2020 | 7 | 2 |
| 2021 | 2 | 5 |
| 2022 | 3 | 1 |
| 2023 | 3 | 2 |
| 2024 | 3 | 4 |
| 2025 | 2 | 3 |
| 2026 | 2 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Sterilization of an object using low energy electron beam28 Jul 2026US 12,691,189 B2Pharmalab Idia Pvt. Ltd.
- Image intensifier with dynamic optocoupler elements24 Feb 2026US 12,562,332 B1
- Extreme-ultraviolet light source device using electron beams21 Oct 2025US 12,451,316 B2Worldbeam Solution Co., Ltd.
- Lattice matched photocathodes for extended wavelengths20 May 2025US 12,308,198 B2L3Harris Technologies, Inc.
- Atomic ovens based on electric discharge1 Oct 2024US 12,106,926 B2IonQ, Inc.
- Sterilization of an object using low energy electron beam13 Aug 2026US 2026/0232852 A1Pharmalab India Pvt. Ltd.
- Sterilization of an object using low energy electron beam13 Aug 2026US 2026/0232853 A1Pharmalab India Pvt. Ltd.
- Sterilization of an object using low energy electron beam4 Dec 2025US 2025/0367334 A1Pharmalab India Pvt. Ltd.
- Design of lattice matched photocathodes for extended wavelengths31 Jul 2025US 2025/0246392 A1L3Harris Technologies, Inc.
- Timescale power beaming transceiver energy storage devices20 Feb 2025US 2025/0062644 A1
Most cited
By later US patents
- Display apparatus for displaying pictures virtually instantaneously96US 5,424,620 ASamsung Electronics Co., Ltd. · 1995
- CRT with field-emission cathode75US 4,178,531 ARCA Corporation · 1979
- Matrix addressing arrangement for a flat panel display with field emission cathodes62US 5,075,591 AColoray Display Corporation · 1991
- Electronic fluorescent display60US 5,229,691 APanocorp Display Systems · 1993
- Electronic fluorescent display54US 5,565,742 APanocorp Display Systems · 1996