H01J 3/022
With microengineered cathode
Official title: {with microengineered cathode, e.g. Spindt-type}
H01J3/022 (With microengineered cathode) appears on 559 US grants and 209 published applications in this corpus.
Search patents in H01J- Granted patents
- 559
- Published applications
- 209
- Assignees
- 132
- Inventors
- 637
- Latest grant
- 16 Jan 2024
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1989 | 2 | 0 |
| 1990 | 2 | 0 |
| 1991 | 7 | 0 |
| 1992 | 12 | 0 |
| 1993 | 17 | 0 |
| 1994 | 15 | 0 |
| 1995 | 17 | 0 |
| 1996 | 35 | 0 |
| 1997 | 35 | 0 |
| 1998 | 59 | 0 |
| 1999 | 63 | 0 |
| 2000 | 50 | 0 |
| 2001 | 34 | 11 |
| 2002 | 40 | 33 |
| 2003 | 28 | 15 |
| 2004 | 21 | 25 |
| 2005 | 18 | 34 |
| 2006 | 13 | 23 |
| 2007 | 18 | 16 |
| 2008 | 12 | 5 |
| 2009 | 15 | 4 |
| 2010 | 8 | 6 |
| 2011 | 8 | 4 |
| 2012 | 2 | 5 |
| 2013 | 4 | 7 |
| 2014 | 3 | 1 |
| 2015 | 4 | 3 |
| 2016 | 3 | 3 |
| 2017 | 1 | 1 |
| 2018 | 1 | 0 |
| 2019 | 4 | 3 |
| 2020 | 1 | 1 |
| 2021 | 2 | 4 |
| 2022 | 2 | 2 |
| 2023 | 2 | 2 |
| 2024 | 1 | 0 |
| 2025 | 0 | 0 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
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Most cited
By later US patents
- Split collector vacuum field effect transistor357US 5,012,153 A1991
- Electron emission device215US 4,904,895 ACanon Kabushiki Kaisha · 1990
- Flat panel field emission display apparatus155US 5,283,500 AAT&T Bell Laboratories · 1994
- Automatically focusing field emission electrode132US 4,874,981 ASRI International · 1989
- Method and apparatus for field emission device electrostatic electron beam focussing129US 5,191,217 AMotorola, Inc. · 1993