H01J 2201/3421
Composition of the emitting surface
H01J2201/3421 (Composition of the emitting surface) appears on 175 US grants and 66 published applications in this corpus.
Search patents in H01J- Granted patents
- 175
- Published applications
- 66
- Assignees
- 75
- Inventors
- 318
- Latest grant
- 16 Jun 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 15 | 0 |
| 1977 | 6 | 0 |
| 1978 | 3 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 2 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 3 | 0 |
| 1986 | 2 | 0 |
| 1987 | 8 | 0 |
| 1988 | 4 | 0 |
| 1989 | 6 | 0 |
| 1990 | 7 | 0 |
| 1991 | 6 | 0 |
| 1992 | 6 | 0 |
| 1993 | 2 | 0 |
| 1994 | 4 | 0 |
| 1995 | 3 | 0 |
| 1996 | 8 | 0 |
| 1997 | 6 | 0 |
| 1998 | 9 | 0 |
| 1999 | 6 | 0 |
| 2000 | 5 | 0 |
| 2001 | 1 | 1 |
| 2002 | 1 | 4 |
| 2003 | 7 | 3 |
| 2004 | 1 | 1 |
| 2005 | 1 | 1 |
| 2006 | 2 | 4 |
| 2007 | 0 | 2 |
| 2008 | 0 | 0 |
| 2009 | 2 | 0 |
| 2010 | 3 | 0 |
| 2011 | 0 | 2 |
| 2012 | 0 | 1 |
| 2013 | 1 | 0 |
| 2014 | 1 | 0 |
| 2015 | 0 | 1 |
| 2016 | 2 | 2 |
| 2017 | 1 | 2 |
| 2018 | 1 | 2 |
| 2019 | 6 | 8 |
| 2020 | 11 | 6 |
| 2021 | 4 | 5 |
| 2022 | 4 | 3 |
| 2023 | 4 | 4 |
| 2024 | 0 | 10 |
| 2025 | 7 | 3 |
| 2026 | 1 | 1 |
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.
- Electron beam devices with semiconductor ultraviolet light source21 Oct 2025US 12,451,314 B2Gaska Consulting, LLC
- Substrate stack epitaxies for photocathodes for extended wavelengths7 Oct 2025US 12,437,954 B2L3Harris Technologies, Inc.
- And manufacturing methods of SWIR I2TUBE via heterogeneous wafer integration17 Jun 2025US 12,334,321 B1L3Harris Technologies, Inc.
- Lattice matched photocathodes for extended wavelengths20 May 2025US 12,308,198 B2L3Harris Technologies, Inc.
- Electron beam devices with semiconductor ultraviolet light source19 Feb 2026US 2026/0051451 A1Gaska Consulting, LLC
- 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.
- Electronically addressable display incorporated into a transmission mode secondary electron image intensifier1 May 2025US 2025/0140505 A1Elbit Systems of America, LLC
- Semiconducting cold photocathode device using electric field to control the electron affinity12 Dec 2024US 2024/0412938 A1
Most cited
By later US patents
- Laser stimulated high current density photoelectron generator and method of manufacture235US 4,460,831 AThermo Electron Corporation · 1984
- Solid state electron amplifier71US 4,990,766 AMurasa International · 1991
- High data rate smart sensor technology62US 6,362,482 B1Advanced Scientific Concepts, Inc. · 2002
- Variable sensitivity transmission mode negative electron affinity photocathode50US 4,644,221 AThe United States of America as represented by the Secretary of the Army · 1987
- High data rate smart sensor46US 6,690,019 B2Advanced Scientific Concepts, Inc. · 2004