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Class Information
Number: 313/337
Name: Electric lamp and discharge devices > Electrode and shield structures > Indirectly heated cathodes
Description: Cathodes which include a cathode member and a source of heat energy for heating the cathode member, the heating means being a member or device separate from the cathode member.










Sub-classes under this class:

Class Number Class Name Patents
313/340 Insulating material between heater and cathode 38
313/339 Interior emissive hollow cathodes 18
313/338 Plural separate cathode sections 33


Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
8679369 Film-forming material and method for predicting film-forming material Mar. 25, 2014
8263942 System, method and apparatus for multi-beam lithography including a dispenser cathode for homogeneous electron emission Sep. 11, 2012
8247958 System, method and apparatus for multi-beam lithography including a dispenser cathode for homogeneous electron emission Aug. 21, 2012
8000449 Emitter for X-ray tubes and heating method therefore Aug. 16, 2011
7710009 System, method and apparatus for multi-beam lithography including a dispenser cathode for homogeneous electron emission May. 4, 2010
7556749 Electron source Jul. 7, 2009
7545089 Sintered wire cathode Jun. 9, 2009
7414356 Cathode structure including barrier for preventing metal bridging from heater to emitter Aug. 19, 2008
7348718 Discharge electrode implemented by a wide bandgap semiconductor and a discharge lamp using the same Mar. 25, 2008
7215070 System, method and apparatus for multi-beam lithography including a dispenser cathode for homogeneous electron emission May. 8, 2007
7138754 Cathode for electron tube and method for manufacturing the same Nov. 21, 2006
7071605 Cathode structure for color cathode ray tube Jul. 4, 2006
7026749 Cathode for electron tube and method of preparing the same Apr. 11, 2006
6992427 High-yield cathode body, cathode sleeve structure, and cathode-ray tube, cathode sleeve substrate, and cathode body production method Jan. 31, 2006
6979942 Cathode emissive body for an impregnated cathode of an electron tube Dec. 27, 2005
6972522 Magnetron Dec. 6, 2005
6917148 Oxide cathode for an electron gun, having a denser and thinner emissive zone Jul. 12, 2005
6903499 Electron gun and a method for using the same Jun. 7, 2005
6828996 Electron beam patterning with a heated electron source Dec. 7, 2004
6815876 Cathode with improved work function and method for making the same Nov. 9, 2004
6798128 Cathode-ray tube cathode and alloy therefor Sep. 28, 2004
6791251 Metal cathode and indirectly heated cathode assembly having the same Sep. 14, 2004
6762544 Metal cathode for electron tube Jul. 13, 2004
6759799 Oxide-coated cathode and method for making same Jul. 6, 2004
6686682 Cathode in cathode ray tube Feb. 3, 2004
6600257 Cathode ray tube comprising a doped oxide cathode Jul. 29, 2003
6552479 Cathode ray tube having an improved heater Apr. 22, 2003
6495949 Electron tube cathode Dec. 17, 2002
6492765 Cathode structure for cathode ray tube Dec. 10, 2002
6492768 Cathode ray tube having an improved indirectly heated cathode Dec. 10, 2002
6417607 Cold electrode for gas discharges Jul. 9, 2002
6376975 Impregnated cathode and method for manufacturing the same Apr. 23, 2002
6362563 Two-layer cathode for electron gun Mar. 26, 2002
6351061 Cathode, method for manufacturing the cathode, and picture tube Feb. 26, 2002
6348756 Electric discharge tube or discharge lamp and scandate dispenser cathode Feb. 19, 2002
6335590 Cathode ray tube having an indirectly heated cathode provided with a heater having a structure which substantially prevents cracks in an insulating coating thereof Jan. 1, 2002
6300711 Indirectly heated cathode with a thermal absorption layer on the sleeve and cathode ray tube Oct. 9, 2001
6252341 Impregnated cathode having varying surface porosity Jun. 26, 2001
6242852 Electron gun Jun. 5, 2001
6232708 Cathode with an electron emitting layer for a cathode ray tube May. 15, 2001
6191528 Cathode ray tube having an improved indirectly heated cathode Feb. 20, 2001
6130502 Cathode assembly, electron gun assembly, electron tube, heater, and method of manufacturing cathode assembly and electron gun assembly Oct. 10, 2000
6091187 High emittance electron source having high illumination uniformity Jul. 18, 2000
6054802 Cathode for electronic tube Apr. 25, 2000
6016026 Impregnated cathode for low power cathode-ray tube Jan. 18, 2000
5982083 Cathode for electron tube Nov. 9, 1999
5959395 Cathode for electron tube Sep. 28, 1999
5945683 Electron beam exposure device Aug. 31, 1999
5936334 Impregnated cathode with composite top coat Aug. 10, 1999
5925976 Cathode for electron tube having specific emissive material Jul. 20, 1999

1 2 3










 
 
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