H01J 19/14
Cathodes heated indirectly by an electric current
Official title: Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment
H01J19/14 (Cathodes heated indirectly by an electric current) appears on 11 US grants and 5 published applications in this corpus.
Search patents in H01J- Granted patents
- 11
- Published applications
- 5
- Assignees
- 12
- Inventors
- 33
- Latest grant
- 4 Aug 2020
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 1 | 0 |
| 1978 | 2 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 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 | 1 |
| 2009 | 0 | 0 |
| 2010 | 1 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 1 |
| 2013 | 0 | 1 |
| 2014 | 0 | 0 |
| 2015 | 1 | 0 |
| 2016 | 1 | 0 |
| 2017 | 0 | 1 |
| 2018 | 0 | 1 |
| 2019 | 0 | 0 |
| 2020 | 2 | 0 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Nuclear powered vacuum microelectronic device4 Aug 2020US 10,734,125 B2Westinghouse Electric Corp.
- Method for preparing pressed scandia-doped dispenser cathodes using microwave sintering12 May 2020US 10,651,000 B2Beijing University of Technology
- Hall-effect motor in which the temperature of the cathode-heating device is controlled12 Apr 2016US 9,309,871 B2Snecma
- Indirectly heated cathode cartridge design7 Jul 2015US 9,076,625 B2Varian Semiconductor Equipment Associates, Inc.
- Power supply unit, high-frequency circuit system and heater voltage control method21 Sep 2010US 7,800,311 B2Netcomsec Co., Ltd.
- Nuclear powered vacuum microelectronic device1 Nov 2018US 2018/0315512 A1Westinghouse Electric Corp.
- Method for preparing pressed scandia-doped dispenser cathodes using microwave sintering30 Nov 2017US 2017/0345608 A1Beijing University of Technology
- Hall-effect motor in which the temperature of the cathode-heating device is controlled23 May 2013US 2013/0125526 A1Snecma
- Indirectly heated cathode cartridge design11 Oct 2012US 2012/0256097 A1Varian Semiconductor Equipment Associates, Inc.
- Power supply unit, high-frequency circuit system and heater voltage control method25 Sep 2008US 2008/0231197 A1NEC Microwave Tube, Ltd.
Most cited
By later US patents
- Grid controlled electron source and method of making same23US 3,967,150 AVarian Associates, Inc. · 1976
- Thermionic electron source with bonded control grid13US 4,096,406 AVarian Associates, Inc. · 1978
- Heater element for an indirectly heated cathode4US 4,002,884 AInternational Standard Electric Corporation · 1977
- Enhanced secondary electron emitter4US 4,975,656 ALitton Systems, Inc. · 1990
- Device having thermionic cathode heated by field-emitted electrons3US 4,115,720 ARCA Corporation · 1978