H01J 2201/2867
Spiral or helix
H01J2201/2867 (Spiral or helix) appears on 11 US grants and 7 published applications in this corpus.
Search patents in H01J- Granted patents
- 11
- Published applications
- 7
- Assignees
- 9
- Inventors
- 23
- Latest grant
- 31 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 1 | 0 |
| 2001 | 1 | 2 |
| 2002 | 2 | 0 |
| 2003 | 1 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 1 | 1 |
| 2008 | 0 | 0 |
| 2009 | 1 | 1 |
| 2010 | 0 | 1 |
| 2011 | 0 | 0 |
| 2012 | 1 | 1 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 0 | 0 |
| 2019 | 0 | 0 |
| 2020 | 0 | 0 |
| 2021 | 0 | 0 |
| 2022 | 0 | 0 |
| 2023 | 0 | 0 |
| 2024 | 0 | 0 |
| 2025 | 0 | 1 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Mounted planar filament31 Mar 2026US 12,592,355 B2Moxtek, Inc.
- Resistively heated small planar filament21 Aug 2012US 8,247,971 B1Moxtek, Inc.
- Filament assembly having reduced electron beam time constant26 May 2009US 7,539,286 B1Varian Medical Systems, Inc.
- Filament for X-ray tube and X-ray tube having the same18 Sep 2007US 7,271,530 B2Rigaku Corporation
- Cathode ray tube having an improved indirectly heated cathode structure2 Sep 2003US 6,614,147 B2Hitachi, Ltd.
- Mounted planar filament6 Mar 2025US 2025/0079108 A1Moxtek, Inc.
- Resistively heated small planar filament23 Aug 2012US 2012/0212157 A1Moxtek, Inc.
- Resistively heated small planar filament23 Sep 2010US 2010/0239828 A1
- Filament assembly having reduced electron beam time constant21 May 2009US 2009/0129550 A1Varian Medical Systems Technologies, Inc.
- Filament for X-ray tube and X-ray tube having the same26 Apr 2007US 2007/0090744 A1Rigaku Corporation
Most cited
By later US patents
- Resistively heated small planar filament14US 8,247,971 B1Moxtek, Inc. · 2012
- High emittance electron source having high illumination uniformity9US 6,091,187 AInternational Business Machines Corporation · 2000
- Cathode ray tube having an improved indirectly heated cathode7US 6,191,528 B1Hitachi, Ltd. · 2001
- Filament assembly having reduced electron beam time constant5US 7,539,286 B1Varian Medical Systems, Inc. · 2009
- Cathode ray tube having an improved indirectly heated cathode3US 6,492,768 B1Hitachi Electronic Devices Co., Ltd. · 2002