US3092748A - Indirectly heated cathode - Google Patents

Indirectly heated cathode Download PDF

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Publication number
US3092748A
US3092748A US14470A US1447060A US3092748A US 3092748 A US3092748 A US 3092748A US 14470 A US14470 A US 14470A US 1447060 A US1447060 A US 1447060A US 3092748 A US3092748 A US 3092748A
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US
United States
Prior art keywords
cathode
heater
disc
indirectly heated
assembly
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
US14470A
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English (en)
Inventor
Jr Herbert F Dickson
Haas Paul
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.)
GTE Sylvania Inc
Original Assignee
Sylvania Electric Products Inc
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 US3097419D priority Critical patent/US3097419A/en
Priority to NL262042D priority patent/NL262042A/xx
Priority to US14471A priority patent/US3160946A/en
Application filed by Sylvania Electric Products Inc filed Critical Sylvania Electric Products Inc
Priority to US14470A priority patent/US3092748A/en
Priority to GB6534/61A priority patent/GB908096A/en
Priority to DES72903A priority patent/DE1186559B/de
Priority to FR855255A priority patent/FR1287645A/fr
Application granted granted Critical
Publication of US3092748A publication Critical patent/US3092748A/en
Priority to US287401A priority patent/US3277685A/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
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/02—Manufacture of electrodes or electrode systems
    • H01J9/04—Manufacture of electrodes or electrode systems of thermionic cathodes
    • 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
    • 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
    • H01J1/22—Heaters
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/04—Cathodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/48—Electron guns
    • H01J29/485—Construction of the gun or of parts thereof
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49082—Resistor making
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49082—Resistor making
    • Y10T29/49087—Resistor making with envelope or housing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49082—Resistor making
    • Y10T29/49087—Resistor making with envelope or housing
    • Y10T29/49096—Resistor making with envelope or housing with winding

Definitions

  • the thermionic cathode cylinder In an electron discharge device such as a cathode ray tube, the thermionic cathode cylinder normally is indirectly heated by a length of coiled insulated resistance wire disposed within the cylinder.
  • the cathode is rigidly headed to a ceramic support disc, which is in turn disposed within the first grid of the tube.
  • An .assembly of this type requires an undesirable amount of power to operate since the efficiency of heat transfer to the cathode cylinder from the resistance Wire is relatively low. Also, the mass of the cylinder and ceramic support causes a large amount of conduction and radiation losses from the entire assembly.
  • a further object is to provide an assembly for such a device which is compact, has high thermal utilization efliciency as a unit, and is adapted for easy assembly and alignment with other electrodes of the device.
  • an indirectly heated cathode assembly adapted for use in an electron discharge device which utilizes a heater embedded cathode structure suspended across an opening provided in an insulating disc by lead wire connections with the ends of the heater and the cathode tab. Heat conduction and radiation losses from the assembly are controlled.
  • FIG. 1 is a plan view of a typical cathode ray tube which is adapted for utilization of the invention
  • FIG. 2 is a top view of the cathode assembly
  • FIG. 3 is a sectional view taken along line 33 of FIG. 2 showing the manner in which the cathode is supported by lead wires;
  • FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. 2 showing the relationship of a lead and a groove in the support formed in a preferred manner;
  • FIG. 5 illustrates the cathode assembly mounted within the first grid of a tube which may be of the type shown in FIG. 1.
  • a cathode ray tube 11 illustrates one type of electron discharge device which may advantageously utilize the invention.
  • Tube 11 comprises an envelope 13 having a face plate 15 with a fluorescent screen 17 formed on the inner surface thereof.
  • a cathode ray tube gun 19 formed to provide the source, modulation and acceleration of electron beam 21 is disposed within neck 23.
  • the beam is conventionally deflected by coils 25 to scan the high potential operated screen 17.
  • Electron gun 19 may comprise a plurality of electrodes including a cathode assembly 27 and a first grid 29.
  • the cathode assembly is constructed to operate with minimum power, which makes tube 11 uniquely adapted for portable and transistorized electrical equipment use. This low power feature is accomplished by employing a cathode 31 having a given configuration with a heater 33 embedded or enclosed therein to provide maximum heat transfer efliciency and utilization coupled with a cathode and heater mounting adapted to minimize heat conduction and radiation losses.
  • the spiral reverse coiled insulated wire of heater 33 may be packed within nickel pellet 31 by powder metallurgy techniques.
  • Such a cathode pellet may have a diameter of .050 inch, a thickness of .011 inch, and a heat radiating surface of .0054 sq. inch, which is a 25:1 reduction over the conventional indirectly heated cathode sleeve radiating surface of about .136 sq. inch normally used in tube 11.
  • the heater configuration and the embedded association of the heater in the cathode plus the minimum heat radiating surface allows maximum utilization of the heater power.
  • any highly thermal eflicient heaterenclosed cathode assembly could conceivably be used, but the illustrated cathode pellet 31 is preferred.
  • cathode 31 and heater 33 are physically mounted and electrically energized under normal operating circumstances, means for accomplishing the mounting and electrical connections are provided which minimize and control heat losses so that the advantages of the high thermal etficiency cathode are fully utilized. Essentially, this is done by suspending cathode 31 across an opening 35 provided in ceramic support disc 37 and providing a unique mounting therefor. The cathode is positioned by means of electrical connections between the uncoated ends 39 of heater 33 and heater leads 41, and between cathode connector or tab 43 and cathode lead 45. Such an arrangement provides the necessary connections and mounting support while minimizing and controlling heat radiating surface areas and conduction paths.
  • insulating coating 47 covers the entire central embedded portion but only part of the free ends of heater 33.
  • the heater wire is preferably made of about .625 inch of .001 inch diam eter tungsten Wire, spiral reverse coil wound, and cataphoretically coated with aluminum oxide to provide l3. coated d ameter of .003 inch.
  • the ratio of the central embedded wire length to non-embedded or free leg length of heater 33 is maintained greater than unity but not greater than 4:1, and preferably between 2 to 1 and 2.5 to 1 while the total length of coated portion 47 outside of pellet 31 does not exceed .75 times the total free leg length of heater 33.
  • the cathode tab 43 may be a nickel alloy .006 inch wide, .002 inch thick and at least .050 inch long. If the tab length becomes too small, the conduction losses. increase undesirably.
  • radially spaced leads 41 and lead connector 45 pass through spaced apertures 49 in disc support 37, and are bent to lie along the upper face of the disc.
  • Lead wires 41 extend partially across central opening 35 and are welded to ends 39 of the heater as illustrated at points 51. It is preferable to flatten wires 41 at their extremities to aid in the production of a good weld and to laterally stabilize the wires within radial V- shaped grooves 53, FIG. 4.
  • Cathode lead Wire connector 45 which also lies within a groove 53, is bent downwardly to pass within opening 35. The end of the C011.
  • cement 55 are used to rigidly afiix leads 41 and connector 45 in position upon support disc 37.
  • the cement is used on the top and bottom surfaces of disc 37 around the leads and connector adjacent the entrance of apertures 49 as well as across connector 45 at a position along groove 53. 7
  • leads 41 and 45 may be mounted in some other manner such as by passing through some type of apertures formed in disc 37 to extend from the apertures laterally into opening 35.
  • a steatite disc 37 of about .355 inch in diameter and .062 inch thick.
  • Central opening 35 may be .170 inch in diameter and the spaced longitudinal apertures 49 disposed intermediate the central opening and the periphery of disc 37 may have a .020 inch diameter. It has been found that apertures 4? are satisfactorily located at a radius of .265 inch from the center of the disc.
  • Leads 41 and 45 which are preferably made of molybdenum, may have a diameter of about .015 inch.
  • pellet 31 is rotatively aligned so that the heater wire ends 39 and tab 43 contact their respective leads 41 and connector 45 without distortion.
  • Pellet 31 may be held at an appropriate distance above the top of disc 37 and spaced centrally within opening 35 by any convenient means such as an appropriate jig. Welding of the leads and wires provides the mounting for the assembly as recited above. It has been found that one of the more important aspects of this mounting procedure is to assure handling of the parts so that there will be no distortion of the heater wire and tab, which is an essential condition for maintaining the upper surface of pellet 31 in 'a parallel relationship with the upper surface of disc 37.
  • assembly 27 may be mounted upon a metallic retainer 57 provided with a flange 59 overlying and circumscribing shoulder 61 of disc 37. Assembly 27 is held rigidly to metallic retainer 57 by means of insert 63, which abuts the bottom of disc 37 opposite shoulder 61.
  • the insert and retainer may be welded or otherwise attached to one another.
  • cathode material 65 may be of the conventional triple carbonate type.
  • the low heater power cathode assembly 27 When the low heater power cathode assembly 27 is to be used with the cathode ray tube 11 such as shown a generally in FIG. 1, it is mounted within the cylindrical 'first grid 29 of gun 19.
  • the aperture 67 in end wall 69 of the grid is aligned with surface of cathode material 65 and spaced therefrom in accordance with the requirements dictated by the desired electrical characteristics of the tube.
  • This cathode to grid spacing may be accurately achieved by any convenient means such as an air or optical comparator or a capacitance gauge (not shown).
  • grid 29 After the proper spacing is achieved, grid 29 is then welded to retainer 57.
  • the complete cathode grid assembly, FIG. 5, may then be mounted with the other elements of gun 19 in the conventional manner.
  • retainer 57 and insert 63 may be formed as an integral unit having the general mounting faculties of the illustrated parts.
  • the cathode assembly shown and described herein provides a unique and dependable low-power consumption unit not heretofore realized for'ope-ration in indirectly heated cathode type electron tubes.
  • This assembly facilitates the fabrication of tube components which lead the trend toward full utilization of transistorized, portable, and other low power equipment. It is notable that although the invention provides percent saving in power for the specific assembly illustrated over conventional structures, the cathode emission and life characteristics are equal and in some respects superior to the conventional cathode assemblies.
  • the specific dimensions and characteristics for the components were given above as an example to illustrate an assembly adapted for use in any otherwise standard construction current television picture tube which normally uses a. common but. arbitrarily selected 1.125 inch diameter neck.
  • a tube employing the invention works well not only with a constant voltage source, but with a variation over the useful Working range of dry cells, namely 1.2 to 1.55 volts. Also, although the contemplated cathode operating temperature for the specific structure illustrated is 775 degrees C., variations of from 650 degrees C. to 800 degrees C. over a range of from 1.2 to 1.6 volts does not abnormally afiect operation. Heater cycling tests at overrated voltage conditions indicated that there is no unusual problem with heater burn-out failures.
  • the type of electron tube with which assembly 27 will be utilized will determine in part many of the parameters and configurations-of the elements. However, the invention contemplates any such device using the heat utilization and controlled heat loss principles involved herein.
  • An indirectly heated cathode assembly adapted for use in an electron discharge device comprising an insulating support provided with a central longitudinal opening, radially spaced leads mounted upon said support extending partially across said central opening, and an indirectly heated cathode structure employing a metallic cathode base having a connector attached thereto and a heater partially enclosed'therein with the free ends thereof extending outwardly from said base, a separate one of said leads being connected to each of said heater free ends and to said cathode connector to provide electrical contacts with said heater and cathode base and to suspend the structure across said central opening.
  • An indirectly heated cathode assembly adapted for use in an electron discharge device comprising an insulating support provided with a central longitudinal opening, radially spaced leads attached to said support extending partially across said central opening, and an indirectly heated cathode structure employing a metallic cathode base pellet, a tab connected to said pellet, and
  • a heater having a given central length thereof embedded in said pellet and outside legs thereof extending from said pellet, said given embedded length ranging from 1 to 4 times the total outside leg lengths, the embedded length of said heater and not more than .75 times said total outside leg length being covered with an insulating coating, a separate one of said leads being connected to each of the opposite ends of said heater legs and tothe tab to provide electrical connections for said heater and cathode base pellet and to suspend the structure across said support central opening.
  • An indirectly heated cathode assembly adapted for use in an electron discharge device comprising a ceramic disc provided with a central longitudinal opening, spaced longitudinal apertures disposed intermediate the peripha lead wire passing through said apertures formed to provide an end thereof lying within said grooves and partially extending across said central opening, and an indirectly heated cathode structure employing a metallic cathode base, a tab connected to said base, and a heater having the central portion thereof enclosed within said base and the outside legs thereof extending from said base, a separate one of said lead wires being connected to each of the opposite ends of said heater legs and to the tab to provide electrical connections for said heater and cathode base and to suspend said structure across said disc central opening.
  • An indirectly heated cathode assembly adapted for use in an electron discharge device comprising a ceramic disc provided with a central longitudinal opening, three spaced longitudinal apertures disposed intermediate the periphery of said disc and said central opening, and spaced radial grooves formed in one face of said disc interconnecting the central opening with each of said spaced apertures, a lead wire passing through each of said apertures formed to provide an end thereof lying within said grooves and partially extending across said central opening, and an indirectly heated cathode structure employing a metallic cathode base pellet, a tab connected to said pellet, and a heater having a given central length thereof embedded in said pellet and outside legs thereof extending from said pellet, said given embedded length ranging firom l to 4 times the total outside leg lengths, the embedded length of said heater and not more than .75 times said total outside leg length being covered with an insulating coating, the ends of two of said lead wires being connected to the opposite ends of said heater legs with the tab being connected to the end of the third lead wire to provide electrical connections for said
  • an indirectly heated cathode assembly comprising an insulating disc provided with a central longitudinal opening, radially spaced lead wires lying along one face of said disc extending partially across said central opening, an indirectly heated cathode structure employing a metallic cathode base having electron emissive material deposited thereon, a tab attached thereto and a heater partially enclosed therein with the free ends thereof extending outwardiy from said base, a separate one of said Wires being connected to each of the ends of said heater and to said tab to provide electrical connections for said heater and cathode base and to suspend said structure across said disc central opening; a cylindrical grid surrounding said assembly having an end Wall formed with an aperture therein aligned relative to said cathode base; and means telescoped Within and affixed to said grid formed to rigidly support said disc to space position said cathode base relative to the grid end wall.
  • an indirectly heated cathode assembly comprising an insulating disc provided with a central longitudinal opening, radially spaced lead Wires lying along one face of said disc extending partially across said central opening, an indirectly heated cathode structure employing a metallic cathode base having electron emissive material deposited thereon, a tab attached thereto and a heater partially enclosed therein with the free ends thereof extending outwardly from said base, a separate one of said wires being connected to each of the ends of said heater and to said tab to provide electrical connections for said heater and cathode base and to suspend said structure across said disc central opening; a cylindrical grid surrounding said assembly having an end Wall formed with an aperture therein aligned relative to said cathode base; a retainer telescoped within and affixed to said grid formed to provide a rim overlying said disc shoulder to space position said cathode base relative to the grid end Wall; and an insert positioned within said grid abutting the face of said disc opposite to the shoulder thereof to rigid

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Solid Thermionic Cathode (AREA)
  • Resistance Heating (AREA)
  • Powder Metallurgy (AREA)
  • Discharge Lamp (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)
US14470A 1960-03-11 1960-03-11 Indirectly heated cathode Expired - Lifetime US3092748A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
US3097419D US3097419A (en) 1960-03-11 dickson
NL262042D NL262042A (enrdf_load_stackoverflow) 1960-03-11
US14470A US3092748A (en) 1960-03-11 1960-03-11 Indirectly heated cathode
US14471A US3160946A (en) 1960-03-11 1960-03-11 Electrical heaters
GB6534/61A GB908096A (en) 1960-03-11 1961-02-22 Heater cathode assembly and support therefor
DES72903A DE1186559B (de) 1960-03-11 1961-03-09 Kathode fuer Elektronenroehren und Verfahren zu ihrer Herstellung
FR855255A FR1287645A (fr) 1960-03-11 1961-03-10 Ensembles élément de chauffage-cathode et leurs supports
US287401A US3277685A (en) 1960-03-11 1963-06-12 Electrical heaters

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US1447260A 1960-03-11 1960-03-11
US14470A US3092748A (en) 1960-03-11 1960-03-11 Indirectly heated cathode
US14471A US3160946A (en) 1960-03-11 1960-03-11 Electrical heaters
US287401A US3277685A (en) 1960-03-11 1963-06-12 Electrical heaters

Publications (1)

Publication Number Publication Date
US3092748A true US3092748A (en) 1963-06-04

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ID=27486394

Family Applications (4)

Application Number Title Priority Date Filing Date
US3097419D Expired - Lifetime US3097419A (en) 1960-03-11 dickson
US14470A Expired - Lifetime US3092748A (en) 1960-03-11 1960-03-11 Indirectly heated cathode
US14471A Expired - Lifetime US3160946A (en) 1960-03-11 1960-03-11 Electrical heaters
US287401A Expired - Lifetime US3277685A (en) 1960-03-11 1963-06-12 Electrical heaters

Family Applications Before (1)

Application Number Title Priority Date Filing Date
US3097419D Expired - Lifetime US3097419A (en) 1960-03-11 dickson

Family Applications After (2)

Application Number Title Priority Date Filing Date
US14471A Expired - Lifetime US3160946A (en) 1960-03-11 1960-03-11 Electrical heaters
US287401A Expired - Lifetime US3277685A (en) 1960-03-11 1963-06-12 Electrical heaters

Country Status (5)

Country Link
US (4) US3092748A (enrdf_load_stackoverflow)
DE (1) DE1186559B (enrdf_load_stackoverflow)
FR (1) FR1287645A (enrdf_load_stackoverflow)
GB (1) GB908096A (enrdf_load_stackoverflow)
NL (1) NL262042A (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3444416A (en) * 1966-09-10 1969-05-13 Sony Corp Electron emitting device and method of assembling the same
US3465195A (en) * 1967-03-10 1969-09-02 Funkwerk Erfurt Veb K Shock and vibration-resistant arrangement for cathodes of small heating power
US3573524A (en) * 1968-04-13 1971-04-06 Sony Corp Multi-apertured grid housing and shielding plurality of cathodes
US4298814A (en) * 1978-10-17 1981-11-03 Tokyo Shibaura Denki Kabushiki Kaisha Directly heated type cathode assembly
US5198720A (en) * 1990-11-27 1993-03-30 Samsung Electron Devices Co., Ltd. Direct heating cathode structure for cathode ray tubes

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3762014A (en) * 1966-05-23 1973-10-02 Mallory & Co Inc P R Apparatus for making capacitors
US9282772B2 (en) 2012-01-31 2016-03-15 Altria Client Services Llc Electronic vaping device

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US2335818A (en) * 1942-09-29 1943-11-30 Rca Corp Cathode assembly
US2413689A (en) * 1942-02-12 1947-01-07 Bell Telephone Labor Inc Electron discharge device
US2888591A (en) * 1956-08-22 1959-05-26 Varian Associates Charged particle emitter apparatus
US2906901A (en) * 1955-07-14 1959-09-29 Paragon Revolute Corp Quartz lamp mounting

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US734350A (en) * 1902-11-04 1903-07-21 Charley Merritt Mcfatridge Wire-bender.
US817386A (en) * 1905-01-11 1906-04-10 Charles E Pickrell Metal-bending appliance.
US1841784A (en) * 1930-07-10 1932-01-19 Leggett And Platt Spring Bed A Bar bending machine
US2287460A (en) * 1940-11-29 1942-06-23 Rca Corp Insulated heater and method of manufacture
US2385386A (en) * 1943-05-07 1945-09-25 Ohio Carbon Company Method of making resistors
US2516930A (en) * 1944-04-14 1950-08-01 Sperry Corp Filament forming method
NL69250C (enrdf_load_stackoverflow) * 1946-03-05
BE475720A (enrdf_load_stackoverflow) * 1946-08-30
US2749029A (en) * 1948-11-26 1956-06-05 Sintercast Corp America Compressor blade
US2548592A (en) * 1949-08-26 1951-04-10 Gen Electric Resistance strain gauge and method for making same
NL246331A (enrdf_load_stackoverflow) * 1951-07-11
NL84939C (enrdf_load_stackoverflow) * 1954-01-01
DE952543C (de) * 1954-02-27 1956-11-15 Siemens Ag Indirekt geheitzte Kathode fuer elektrische Entladungsgefaesse
US2936516A (en) * 1954-05-17 1960-05-17 John A Adair Method of making a dielectric core and resistor
FR1178741A (fr) * 1956-08-06 1959-05-14 Procédé pour élever la limite d'allongement et augmenter la résistance de produits en acier laminé, notamment des aciers pour béton armé, et dispositif permettantd'appliquer ce procédé
US2919373A (en) * 1957-01-22 1959-12-29 Edgerton Germeshausen & Grier Cathode heater

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2413689A (en) * 1942-02-12 1947-01-07 Bell Telephone Labor Inc Electron discharge device
US2335818A (en) * 1942-09-29 1943-11-30 Rca Corp Cathode assembly
US2906901A (en) * 1955-07-14 1959-09-29 Paragon Revolute Corp Quartz lamp mounting
US2888591A (en) * 1956-08-22 1959-05-26 Varian Associates Charged particle emitter apparatus

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3444416A (en) * 1966-09-10 1969-05-13 Sony Corp Electron emitting device and method of assembling the same
US3465195A (en) * 1967-03-10 1969-09-02 Funkwerk Erfurt Veb K Shock and vibration-resistant arrangement for cathodes of small heating power
US3573524A (en) * 1968-04-13 1971-04-06 Sony Corp Multi-apertured grid housing and shielding plurality of cathodes
US4298814A (en) * 1978-10-17 1981-11-03 Tokyo Shibaura Denki Kabushiki Kaisha Directly heated type cathode assembly
US5198720A (en) * 1990-11-27 1993-03-30 Samsung Electron Devices Co., Ltd. Direct heating cathode structure for cathode ray tubes

Also Published As

Publication number Publication date
US3097419A (en) 1963-07-16
US3277685A (en) 1966-10-11
NL262042A (enrdf_load_stackoverflow)
FR1287645A (fr) 1962-03-16
DE1186559B (de) 1965-02-04
GB908096A (en) 1962-10-17
US3160946A (en) 1964-12-15

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