H01J 9/12
Of photo-emissive cathodes
Official title: of photo-emissive cathodes; of secondary-emission electrodes
H01J9/12 (Of photo-emissive cathodes) appears on 261 US grants and 100 published applications in this corpus.
Search patents in H01J- Granted patents
- 261
- Published applications
- 100
- Assignees
- 102
- Inventors
- 404
- Latest grant
- 16 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 10 | 0 |
| 1977 | 12 | 0 |
| 1978 | 15 | 0 |
| 1979 | 7 | 0 |
| 1980 | 6 | 0 |
| 1981 | 7 | 0 |
| 1982 | 5 | 0 |
| 1983 | 8 | 0 |
| 1984 | 2 | 0 |
| 1985 | 2 | 0 |
| 1986 | 6 | 0 |
| 1987 | 8 | 0 |
| 1988 | 6 | 0 |
| 1989 | 10 | 0 |
| 1990 | 11 | 0 |
| 1991 | 7 | 0 |
| 1992 | 5 | 0 |
| 1993 | 2 | 0 |
| 1994 | 2 | 0 |
| 1995 | 5 | 0 |
| 1996 | 9 | 0 |
| 1997 | 4 | 0 |
| 1998 | 4 | 0 |
| 1999 | 2 | 0 |
| 2000 | 9 | 0 |
| 2001 | 4 | 0 |
| 2002 | 2 | 2 |
| 2003 | 2 | 2 |
| 2004 | 2 | 6 |
| 2005 | 2 | 7 |
| 2006 | 6 | 6 |
| 2007 | 2 | 5 |
| 2008 | 3 | 1 |
| 2009 | 3 | 3 |
| 2010 | 3 | 4 |
| 2011 | 2 | 3 |
| 2012 | 2 | 1 |
| 2013 | 2 | 5 |
| 2014 | 6 | 3 |
| 2015 | 3 | 4 |
| 2016 | 4 | 5 |
| 2017 | 1 | 4 |
| 2018 | 8 | 3 |
| 2019 | 7 | 8 |
| 2020 | 7 | 4 |
| 2021 | 7 | 3 |
| 2022 | 0 | 5 |
| 2023 | 4 | 5 |
| 2024 | 5 | 8 |
| 2025 | 9 | 3 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Photocathode including nanostructures for extended wavelengths16 Jun 2026US 12,658,397 B2L3Harris Technologies, Inc.
- Cathode member for electron beam generation, and method for manufacturing the same7 Oct 2025US 12,437,953 B2Kobelco Research Institute, Inc.
- Substrate stack epitaxies for photocathodes for extended wavelengths7 Oct 2025US 12,437,954 B2L3Harris Technologies, Inc.
- Electron beam application device7 Oct 2025US 12,437,958 B2Hitachi High-Tech Corporation
- Metasurface element, electron tube, and method for producing electron tube26 Aug 2025US 12,400,821 B2Hamamatsu Photonics K.K.
- Substrate stack epitaxies for photocathodes for extended wavelengths18 Dec 2025US 2025/0385062 A1L3Harris Technologies, Inc.
- Design of lattice matched photocathodes for extended wavelengths31 Jul 2025US 2025/0246392 A1L3Harris Technologies, Inc.
- Microchannel plate and method of making the microchannel plate with an electron backscatter layer to amplify first strike electrons22 May 2025US 2025/0166954 A1Elbit Systems of America, LLC
- Devices and methods involving semiconducting material(s) for photocathodes22 Aug 2024US 2024/0282542 A1The Board of Trustees of the Leland Stanford Junior University
- A uv sensitive photocathode, a method for producing a uv sensitive photocathode, and a detector for measuring uv radiation11 Jul 2024US 2024/0234072 A9Fenno-Aurum Oy
Most cited
By later US patents
- Polymeric compositions for manufacture of secondary electron multiplier tubes and method for manufacture thereof291US 4,093,562 AMatsushita Electric Industrial Co., Ltd. · 1978
- Laser stimulated high current density photoelectron generator and method of manufacture235US 4,460,831 AThermo Electron Corporation · 1984
- Method of making a plate having a pattern of microchannels180US 4,153,855 AThe United States of America as represented by the Secretary of the Army · 1979
- Generating electrons with an activated photocathode68US 7,015,467 B2APPLIED Materials.Inc. · 2006
- Process for making III-V devices51US 3,959,045 AVarian Associates, Inc. · 1976