H01J 21/00
Vacuum tubes
Official title: Vacuum tubes (H01J25/00, H01J31/00 - H01J40/00, H01J43/00, H01J47/00, H01J49/00 take precedence; details of vacuum tubes H01J19/00)
H01J21/00 (Vacuum tubes) appears on 301 US grants and 150 published applications in this corpus.
Search patents in H01J- Granted patents
- 301
- Published applications
- 150
- Assignees
- 148
- Inventors
- 497
- Latest grant
- 25 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 3 | 0 |
| 1978 | 3 | 0 |
| 1979 | 3 | 0 |
| 1980 | 1 | 0 |
| 1981 | 2 | 0 |
| 1982 | 2 | 0 |
| 1983 | 2 | 0 |
| 1984 | 1 | 0 |
| 1985 | 2 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 3 | 0 |
| 1990 | 1 | 0 |
| 1991 | 11 | 0 |
| 1992 | 13 | 0 |
| 1993 | 16 | 0 |
| 1994 | 8 | 0 |
| 1995 | 19 | 0 |
| 1996 | 6 | 0 |
| 1997 | 10 | 0 |
| 1998 | 15 | 0 |
| 1999 | 6 | 0 |
| 2000 | 8 | 0 |
| 2001 | 5 | 2 |
| 2002 | 6 | 1 |
| 2003 | 2 | 4 |
| 2004 | 2 | 4 |
| 2005 | 3 | 10 |
| 2006 | 6 | 6 |
| 2007 | 2 | 6 |
| 2008 | 5 | 6 |
| 2009 | 3 | 6 |
| 2010 | 11 | 4 |
| 2011 | 4 | 3 |
| 2012 | 6 | 2 |
| 2013 | 3 | 6 |
| 2014 | 6 | 7 |
| 2015 | 13 | 10 |
| 2016 | 8 | 13 |
| 2017 | 15 | 16 |
| 2018 | 10 | 11 |
| 2019 | 9 | 7 |
| 2020 | 12 | 9 |
| 2021 | 13 | 7 |
| 2022 | 2 | 1 |
| 2023 | 5 | 6 |
| 2024 | 7 | 2 |
| 2025 | 1 | 1 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Vacuum tunneling device and method of manufacturing the same25 Aug 2026US 12,716,124 B2Daegu Gyeongbuk Institute of Science and Technology
- Method for amplifying electromagnetic waves with wirebonded triode23 Dec 2025US 12,505,971 B2
- Vacuum tube for amplifier circuit, and amplifier circuit using same19 Nov 2024US 12,149,214 B2Hamamatsu Photonics K.K.
- Vacuum tube amplifier module and assembly method thereof24 Sep 2024US 12,101,064 B2Dreamus Company
- Systems and methods for creating an electron coil magnet17 Sep 2024US 12,094,679 B2Vacon Oy
- Systems and methods for creating an electron coil magnet2 Jan 2025US 2025/0006425 A1Vacon Oy
- Silicon-Based Vacuum Transistors and Integrated Circuits6 Jun 2024US 2024/0186097 A1Purdue Research Foundation
- Method for amplifying electromagnetic waves with wirebonded triode16 May 2024US 2024/0161995 A1
- Terahertz capable integrated circuit21 Sep 2023US 2023/0299184 A1Averoses, Inc.
- Triode with wirebonded structure and method of making13 Jul 2023US 2023/0223229 A1
Most cited
By later US patents
- Split collector vacuum field effect transistor357US 5,012,153 A1991
- Sealed micromachined vacuum and gas filled devices173US 5,493,177 AThe Regents of the University of California · 1996
- Process and structure of an integrated vacuum microelectronic device107US 5,203,731 AInternational Business Machines Corporation · 1993
- Field emission vacuum devices101US 4,827,177 AGeneral Electric Company · 1989
- Vacuum-sealed silicon incandescent light81US 5,285,131 AUniversity of California, Berkeley · 1994