US2723363A - Cathode and method of producing same - Google Patents

Cathode and method of producing same Download PDF

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Publication number
US2723363A
US2723363A US279888A US27988852A US2723363A US 2723363 A US2723363 A US 2723363A US 279888 A US279888 A US 279888A US 27988852 A US27988852 A US 27988852A US 2723363 A US2723363 A US 2723363A
Authority
US
United States
Prior art keywords
cathode
coating
carbide
sleeve
tantalum
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US279888A
Other languages
English (en)
Inventor
Santis Vincent J De
Robert E Manfredi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Electric Co
Original Assignee
General Electric Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to BE518861D priority Critical patent/BE518861A/xx
Application filed by General Electric Co filed Critical General Electric Co
Priority to US279888A priority patent/US2723363A/en
Priority to GB8242/53A priority patent/GB725719A/en
Priority to FR1073802D priority patent/FR1073802A/fr
Priority to DEG11418A priority patent/DE967715C/de
Application granted granted Critical
Publication of US2723363A publication Critical patent/US2723363A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
    • H01J1/02—Main electrodes
    • H01J1/13—Solid thermionic cathodes
    • H01J1/20—Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment
    • H01J1/26—Supports for the emissive material

Definitions

  • An indirectly heated cathode comprising a cylindrical sleeve of tantalum, a coating of tungsten carbide on the inner surface of said sleeve, an electron emissive coating on the outer surface of said sleeve consisting essentially of thorium oxide and a heater element positioned within said sleeve, said carbide coating increasing the heat absorption of said sleeve, minimizing reflection of heat to said heater and thereby increasing the emission current from the cathode sleeve for a given heater power input.

Landscapes

  • Solid Thermionic Cathode (AREA)
US279888A 1952-04-01 1952-04-01 Cathode and method of producing same Expired - Lifetime US2723363A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
BE518861D BE518861A (en, 2012) 1952-04-01
US279888A US2723363A (en) 1952-04-01 1952-04-01 Cathode and method of producing same
GB8242/53A GB725719A (en) 1952-04-01 1953-03-25 Improvements in and relating to cathodes for electric discharge devices
FR1073802D FR1073802A (fr) 1952-04-01 1953-03-27 Cathode perfectionnée et méthode de fabrication
DEG11418A DE967715C (de) 1952-04-01 1953-04-02 Mittelbar geheizte Thoriumkathode fuer elektrische Entladungsroehren

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US279888A US2723363A (en) 1952-04-01 1952-04-01 Cathode and method of producing same

Publications (1)

Publication Number Publication Date
US2723363A true US2723363A (en) 1955-11-08

Family

ID=23070780

Family Applications (1)

Application Number Title Priority Date Filing Date
US279888A Expired - Lifetime US2723363A (en) 1952-04-01 1952-04-01 Cathode and method of producing same

Country Status (5)

Country Link
US (1) US2723363A (en, 2012)
BE (1) BE518861A (en, 2012)
DE (1) DE967715C (en, 2012)
FR (1) FR1073802A (en, 2012)
GB (1) GB725719A (en, 2012)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2768321A (en) * 1955-05-02 1956-10-23 Rca Corp Indirectly heated electron emitter for power tubes and the like
US2949557A (en) * 1957-10-04 1960-08-16 Philips Corp Equipotential cathode for electric discharge tubes
US3034479A (en) * 1957-10-17 1962-05-15 Larsh Apparatus for flow coating the slots of a slotted stator
US3262814A (en) * 1960-12-15 1966-07-26 Philips Corp Method for coating an indirectly heated cathode
US3475161A (en) * 1967-03-14 1969-10-28 Howmet Corp Method of forming cemented carbide coatings on metal surfaces by employing volatile,organic liquid solvents and organic binders
US3881126A (en) * 1974-03-06 1975-04-29 Gte Sylvania Inc Fast warm-up cathode assembly
US3958146A (en) * 1974-02-08 1976-05-18 Gte Sylvania Incorporated Fast warm up picture tube cathode cap having high heat emissivity surface on the interior thereof
US4569198A (en) * 1983-03-11 1986-02-11 Technion, Incorporated Heater/emitter assembly
US4730449A (en) * 1983-07-26 1988-03-15 Technion, Inc. Radiation transfer thrusters for low thrust applications
USRE32918E (en) * 1983-03-11 1989-05-09 Technion, Inc. Heater/emitter assembly

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1080700B (de) * 1958-05-17 1960-04-28 Deutsche Elektronik Gmbh Verfahren zur Herstellung einer indirekt geheizten Kathode, insbesondere fuer Magnetrons hoher Schwingleistung, und nach diesem Verfahren hergestellte Kathode
GB1004776A (en) * 1961-03-15 1965-09-15 Gen Electric Improvements in cathode construction
DE1133835B (de) * 1961-12-16 1962-07-26 Telefunken Patent Verfahren zur Herstellung einer mittelbar geheizten Kathode fuer eine elektrische Entladungsroehre
DE19828158C1 (de) * 1998-06-24 1999-11-25 Siemens Ag Indirekt geheizte Kathode, insbesondere für Röntgenröhren

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1886705A (en) * 1926-02-06 1932-11-08 Arsene N Lucian Indirect electron excitation for thermionic vacuum tubes
US2115828A (en) * 1935-04-13 1938-05-03 Bell Telephone Labor Inc Electron emitting cathode and method of preparation
US2284655A (en) * 1939-10-26 1942-06-02 Lorenz C Ag Electric discharge tube
US2314097A (en) * 1942-02-06 1943-03-16 Int Standard Electric Corp Equipotential cathode
US2438732A (en) * 1947-03-15 1948-03-30 Eitel Mcculough Inc Electron tube cathode

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE710283C (de) * 1936-10-03 1941-09-09 Aeg UEberzug von Tantalkarbid auf nicht zur Emission dienende Elektroden elektrischer Entladungsgefaesse und Verfahren zu seiner Aufbringung
DE715156C (de) * 1937-07-23 1941-12-16 Aeg Verfahren zum Aufbringen eines UEberzuges von Zirkon- und/oder Niobcarbid oder eines UEberzuges aus einer Beimengung dieser Carbide zu Tantalcarbid auf nicht zur Emission dienende Elektroden
NL54775C (en, 2012) * 1940-01-24

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1886705A (en) * 1926-02-06 1932-11-08 Arsene N Lucian Indirect electron excitation for thermionic vacuum tubes
US2115828A (en) * 1935-04-13 1938-05-03 Bell Telephone Labor Inc Electron emitting cathode and method of preparation
US2284655A (en) * 1939-10-26 1942-06-02 Lorenz C Ag Electric discharge tube
US2314097A (en) * 1942-02-06 1943-03-16 Int Standard Electric Corp Equipotential cathode
US2438732A (en) * 1947-03-15 1948-03-30 Eitel Mcculough Inc Electron tube cathode

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2768321A (en) * 1955-05-02 1956-10-23 Rca Corp Indirectly heated electron emitter for power tubes and the like
US2949557A (en) * 1957-10-04 1960-08-16 Philips Corp Equipotential cathode for electric discharge tubes
US3034479A (en) * 1957-10-17 1962-05-15 Larsh Apparatus for flow coating the slots of a slotted stator
US3262814A (en) * 1960-12-15 1966-07-26 Philips Corp Method for coating an indirectly heated cathode
US3475161A (en) * 1967-03-14 1969-10-28 Howmet Corp Method of forming cemented carbide coatings on metal surfaces by employing volatile,organic liquid solvents and organic binders
US3958146A (en) * 1974-02-08 1976-05-18 Gte Sylvania Incorporated Fast warm up picture tube cathode cap having high heat emissivity surface on the interior thereof
US3881126A (en) * 1974-03-06 1975-04-29 Gte Sylvania Inc Fast warm-up cathode assembly
US4569198A (en) * 1983-03-11 1986-02-11 Technion, Incorporated Heater/emitter assembly
USRE32918E (en) * 1983-03-11 1989-05-09 Technion, Inc. Heater/emitter assembly
US4730449A (en) * 1983-07-26 1988-03-15 Technion, Inc. Radiation transfer thrusters for low thrust applications

Also Published As

Publication number Publication date
FR1073802A (fr) 1954-09-29
GB725719A (en) 1955-03-09
DE967715C (de) 1957-12-05
BE518861A (en, 2012)

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