H01J 2225/34
Travelling-wave tubes
Official title: Travelling-wave tubes; Tubes in which a travelling wave is simulated at spaced gaps
H01J2225/34 (Travelling-wave tubes) appears on 22 US grants and 4 published applications in this corpus.
Search patents in H01J- Granted patents
- 22
- Published applications
- 4
- Assignees
- 16
- Inventors
- 42
- Latest grant
- 25 Apr 2006
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1994 | 1 | 0 |
| 1995 | 2 | 0 |
| 1996 | 0 | 0 |
| 1997 | 2 | 0 |
| 1998 | 1 | 0 |
| 1999 | 4 | 0 |
| 2000 | 1 | 0 |
| 2001 | 3 | 2 |
| 2002 | 4 | 0 |
| 2003 | 3 | 1 |
| 2004 | 0 | 0 |
| 2005 | 0 | 1 |
| 2006 | 1 | 0 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
- H01J 2225/36Tubes in which an electron stream interacts with a wave travelling alongIndexing code10
- H01J 2225/42Tubes in which an electron stream interacts with a wave travelling alongIndexing code1
- H01J 2225/48Tubes in which two electron streams of different velocities interact with oneIndexing code0
- H01J 2225/49Tubes using the parametric principleIndexing code0
Recent patents
- Power supply apparatus for traveling-wave tube which eliminates high voltage relay25 Apr 2006US 7,034,472 B2NEC Microwave Tube, Ltd.
- Broadband, inverted slot mode, coupled cavity circuit15 Jul 2003US 6,593,695 B2Northrop Grumman Corporation
- Method for fabricating three dimensional traveling wave tube circuit elements using laser lithography1 Jul 2003US 6,584,675 B1
- Field emitting device comprising field-concentrating nanoconductor assembly and method for making the same25 Mar 2003US 6,538,367 B1Agere Systems Inc.
- Multibeam electronic tube with magnetic field for correcting beam trajectory26 Nov 2002US 6,486,605 B1Thomson Tubes Electroniques
- Power supply apparatus for traveling-wave tube which eliminates high voltage relay31 Mar 2005US 2005/0067966 A1NEC Microwave Tube, Ltd.
- Broadband, inverted slot mode, coupled cavity circuit13 Feb 2003US 2003/0030390 A1Northrop Grumman Corporation
- High voltage resistance, particularly for current limitation in a microwave progressive wave tube emitter13 Sep 2001US 2001/0020890 A1Thomson-CSF
- Broadband, inverted slot mode, coupled cavity circuit16 Aug 2001US 2001/0013757 A1Northrop Grumman Corporation
Most cited
By later US patents
- Field emitting device comprising field-concentrating nanoconductor assembly and method for making the same102US 6,538,367 B1Agere Systems Inc. · 2003
- Field-emission cold-cathode electron gun having emitter tips between the top surface of gate electrode and focusing electrode14US 5,986,388 ANEC Corporation · 1999
- System and method for recovering power from a traveling wave tube13US 6,111,358 AHughes Electronics Corporation · 2000
- Power enhancement techniques for high power satellites11US 5,862,462 ASpace Systems/Loral, Inc. · 1999
- Method for fabricating three dimensional traveling wave tube circuit elements using laser lithography11US 6,584,675 B12003