H01J 23/50
The interaction circuit being a helix or derived from a helix
Official title: the interaction circuit being a helix or derived from a helix (H01J23/52 takes precedence)
H01J23/50 (The interaction circuit being a helix or derived from a helix) appears on 8 US grants and 1 published applications in this corpus.
Search patents in H01J- Granted patents
- 8
- Published applications
- 1
- Assignees
- 8
- Inventors
- 14
- Latest grant
- 1 Mar 2011
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 1 |
| 2010 | 0 | 0 |
| 2011 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Traveling wave tube1 Mar 2011US 7,898,181 B2Netcomsec Co., Ltd.
- Travelling wave tube provided with an impervious coupling device between its delay line and an external microwave circuit15 Jan 1991US 4,985,659 AThomson-CSF
- Travelling wave tube with coupling device between its delay line and external microwave circuits13 Nov 1990US 4,970,432 AThomson-CSF
- Microwave tube with improved output signal extracting structure21 Jul 1987US 4,682,076 ANEC Corporation
- Travelling wave or like tubes29 Apr 1986US 4,585,973 AEnglish Electric Valve Company Limited
Most cited
By later US patents
- High efficiency split flow turbine for compressible fluids7US 4,165,949 AGroupe Europeen pour la Technique des Turbines a Vapeur G.E.T.T. · 1979
- Travelling wave tube provided with an impervious coupling device between its delay line and an external microwave circuit5US 4,985,659 AThomson-CSF · 1991
- Traveling wave tube having a helix delay line4US 4,035,687 ASiemens Aktiengesellschaft · 1977
- Process for the nitration of haloaromatics3US 3,957,890 AMonsanto Company · 1976
- Microwave tube with improved output signal extracting structure3US 4,682,076 ANEC Corporation · 1987