US2564716A - Magnetron and method of manufacture - Google Patents

Magnetron and method of manufacture Download PDF

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Publication number
US2564716A
US2564716A US460376A US46037642A US2564716A US 2564716 A US2564716 A US 2564716A US 460376 A US460376 A US 460376A US 46037642 A US46037642 A US 46037642A US 2564716 A US2564716 A US 2564716A
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United States
Prior art keywords
cavity
lead
magnetron
cathode
casing
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Expired - Lifetime
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US460376A
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English (en)
Inventor
Okress Ernest Carl
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.)
CBS Corp
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Westinghouse Electric Corp
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 BE474540D priority Critical patent/BE474540A/xx
Priority to BE473775D priority patent/BE473775A/xx
Priority to NL68027D priority patent/NL68027C/xx
Application filed by Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Priority to US460376A priority patent/US2564716A/en
Priority to US462132A priority patent/US2520955A/en
Priority to GB7535/47A priority patent/GB636005A/en
Priority to GB8102/47A priority patent/GB646704A/en
Priority to CH271573D priority patent/CH271573A/de
Priority to CH262105D priority patent/CH262105A/de
Priority to FR988427D priority patent/FR988427A/fr
Priority to FR57617D priority patent/FR57617E/fr
Application granted granted Critical
Publication of US2564716A publication Critical patent/US2564716A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
    • H01J23/16—Circuit elements, having distributed capacitance and inductance, structurally associated with the tube and interacting with the discharge
    • H01J23/165—Manufacturing processes or apparatus therefore

Definitions

  • This invention relates to generators of high frequency electricity, and particularly those of the type called magnetrons.
  • V The principal object of my invention, generally considered, is an improved magnetron for energy in the region of ten centimeter wavelengths and a method of manufacture, as well as an improved portion thereof such as the cathode lead assembly.
  • Another object of my invention is the manufacture of magnetrons by a, method which avoids the necessity of very accurate machining.
  • a further object of my invention is to simplify and cheapen the construction of magnetrons.
  • a still further object of my invention is to increase the permissive tolerances in the manufacture of magnetrons.
  • An additional object of my invention is to pro-' vide an improved coupling arrangement for magnetrons.
  • Another object of my invention is to'provide an improved filtered cathode lead assembly for magnetrons.
  • a further object of my invention is to provide an improved method of manufacturing magnetrons.
  • Fig. 1 is a sectional view on the line I-I of Fig. 2, in the direction of the arrows, with parts in elevation, of a magnetron embodyingmy invention.
  • Fig. 2 is a sectional view on the line II-II of Fig. 1, in the direction of the arrows.
  • Fig. 3 is an enlarged sectional view of a portion of the magnetron shown in Fig. 2.
  • Fig. 4 is a view corresponding to Fig. 3, but showing a modification.
  • Fig.5 is a view corresponding to Fig. 3, but showing another modification.
  • Fig. 6 is a sectional perspective view of a blank from which the body member of the magnetron may be manufactured.
  • Fig. 7 is a perspective view of said blank after a preliminary operation has been performed thereon.
  • Fig. 8 is a, transverse sectional view of a hollow generally cylindrical body portion in which the processed blank of Fig. 7 it to be fitted.
  • Fig. 9 is a view corresponding to Fig. 8, but showing the blank of Fig. 7 in place in the hollow body portion, with soldering material positioned for connecting the parts.
  • Fig. 10 is a view corresponding to Fig. 9, but showing the parts after connection and after removing the central core to provide the cathode- 2 receiving chamber, completing the resonant cavity.
  • Fig. 11 is a diagrammatic representation of a multiple slot magnetron embodying my invention, in order to indicate what the dimensions of the following raphs refer to.
  • Fig. 12 is a diagrammatic representation of a conventional or multiple cavity magnetron, over which the present magnetron is an improvement, in order to indicate what the dimensions of the following graphs refer to.
  • Fig. 13 is a graph showing the relationship between the free space wavelength of the generated energy and the width of the slot for the eight slot type and the eight cavity type magnetrons.
  • Fig. 14 is a graph showing the relationship between the free space wavelength of the generated energy and the slot length for the eight slot type and the eight cavity type magnetrons.
  • Fig. 15 is a graph showing the relationship between the free space wavelength of the generated energy and the diameter of one of the cavities in the eight cavity type magnetrons.
  • Figs. 16 and 17 are fragmentary, diagrammatic views corresponding to Fig. 1, but showing other modifications.
  • Resonant cavity magnetrons such as those in the 10 centimeter range, have previously been constructed exclusively in accordance with that designated 10 in Fig. 1 of the Okress et al. application, Serial No. 457,024, filed September 2, 1942 which issued on Jan. 13, 1948 as Patent No. 2,434,508, that designated 11 in Fig. 1 of the Mouromtseif et a1.
  • Such structures require very accurate machining with tolerances of the order of onehalf a thousandth of an inch for dimensions such as the diameter (2a) of the cylindrical cavities, the width -(t) of the slots leading from the anode chamber to said cavities, the radial length (Z) of said slots and the diameter (21a) of the cathode receiving chamber due to the high wavelength sensitivity, as shown by the following table.
  • a magnetron H consisting of a body or anode portion l2 of oxygen-free, high-conductivit-y copper having generally triangular, trapezoidal or sector shaped selenium copper alloy (described by Smith in A. I. M. & M. E. lech. Pub. No. 870) portions I3, I l, l5, 16,17, l8, l9 and 2t projecting inwardly from the peripheral portion'22and' separated by slots 23, 24, 25, 2B, 27, 28, Hand 3
  • One'of the segments, such as 18, has a recess 34 t which the inner end of the composite coaxial terminal 35 is afilxed, said terminal in the present instance having its large and tapering portions formed of tungsten and its small or inner portion formed of electrolytic copper and being enclosed in tubular copper casing 35 having an annular flange 31 threaded as indicated at 38 for a coaxial capacitive cable coupling, which may correspond with the threaded-portion 24 of the Rigrod et al. application, Serial No. 454,615, filed August 12, 1942, which issued on September 24, 1946, as Patent No.
  • This casing36 is desirably threadably connected to a boss 39 outstanding from the pe ripheral portion 22 of the device and desirably formed of similar material.
  • the terminal 35 is' desirably centered with respect to the casing 35, as by means of a Corning #704 or soft borosilicate glass bead 6
  • BT solder melts at about 779 C.,and is 72% silver and 28% copper.
  • the cathode 33 in the present embodiment is shown as consisting of a helical tungsten filament 43 enclosed in an electron-emitting housing 44 composed of a mixture of oxides of strontium,
  • RT solder melts at about 682 C. and is 60% silver, copper, and 15% zinc.
  • the slotted arrangement illustrated rather than the conventional cylindrical cavity system previously referred to, permits the use of a more liberal tolerance of the order of one or two thousandths of an inch, as compared with the extremely small tolerance necessary in the conventional construction evident from tables already referred to.
  • l3,- l4 and 15 indicate definitel that the multiple slotted type magnetron for about 10 centimeter waves, in accordance with my invention;*--per mits more tolerance for the critical dimensions, controlling the wavelength than thecon'ventional type referred to.
  • the eight cavity magnetron has a wavelength sensitivity, with regard to slot width, approximately 29% greater than that for slot length variations and approximately 75% greater than that for cavity diameter variations.
  • the eight slot magnetron has a Wavelength sensitivity, with reguard to slot length, approximately three times as great as that for slot width.
  • the eight cavity magnetron is approximately 14.5 times as sensitive to slot width variations and approximately 3 /2 times as sensitive to slot length variations as the equivalent eight slot magnetron.
  • the method of coupling shown in Fig. 1 represents and permits accurate control of the coupling coefficient, since .it is dependent upon the position of the recess 34 and the coaxial tube or terminal receiving cavity 5?.
  • This, arrangement is superiormechanically and electrically as, compared with either the end cavityor loop terminal generally used and illustrated in the Okress et a1. application previously referred to.
  • a cathode lead assembly is illustratedmore in detail in Fig. 3.
  • a filter for such an assembly included a cup opening toward the magnetron or other generator and, with its closed end portion secured to the lead, as by silver soldering 'on a previously nlckel plated tungstencons ductor over an efiective area. That arrangement had several disadvantages, such as: nickel-plating tungsten; soldering a cup on. a' tungsten.
  • the improved construction illustrated in Fig. 3 overcomes all of the above disadvantages by connecting the filter sleeve 53 to the cathode-lead casing 4'! rather than the lead 45.
  • the radio-frequency energy tending to enter the cathode-lead assembly 54 from the magnetron body encounters the filter section 53 which may be formed as a tube of electrolytic copper or similar material.
  • the filter section 53 which may be formed as a tube of electrolytic copper or similar material.
  • Z represents the characteristic impedance of the annular chamber 55 and Q is expressed by 27r bi (where is the wavelength and R the resistance per unit length) which can be made relatively large by suitable choice of radial parameters and material composing the walls of the annular chamber 55.
  • the cathode-lead casing 41 which may be of copper
  • the sleeve 6 l which may be of Kovar or other material which seals readily to the glass 62
  • the preferably electrolytic copper tube filter section 53 it is to be noted that only one gold-copper eutectic soldering operation is necessary, as indicated at 63, as the inner end of the Kovar sleeve 6
  • This simple, though effective, cathodelead assembly requires no special fixtures except for aligning the desirably tungsten lead 45 which is free of all encumbrances.
  • the filter section 53 may be a spinning and have a hollow cylindrical extension 6
  • the section 53* may then be plated with suitable high conducting metal, such as copper or silver, before soldering in place as indicated at 63
  • the casing 41"- may be shouldered as indicated at 65 in Fig. 4, or formed as designated at 41 in Fig. 5 without a shoulder and made of suitable material so that an annular weld may be formed at 66 between the spinning 53 6l and the casing 41 when a proper adjustment therebetween is made.
  • soldering may be effected as indicated at 63*.
  • seamless steel tubing may replace copper for making the cylindrical portion of the casing 41 as indicated at 66 and 66. It is evident that with high axial magnetic field strengths required for high power, such a structure cannot be used although it is feasible for low power.
  • the portions 41' and Sl may be formed as a continuous cylinder with an annular flange 64 of the section 53 welded or otherwise secured to the inner surface of said cylinder.
  • Figs. 6 to 10, inclusive show the parts of the magnetron body during the process of manufacture.
  • I desirably start with a cylindrical disk 61 of selenium copper alloy or other similar metal and provide a threaded centering pocket 68 in one side opposite a centering cavity 69 in the other.
  • a steel stud is then secured into the threaded portion 68.
  • This blank may then be mounted in a lathe and turned to truly cylindrical form about the centering cavity 69, or otherwise formed so that the peripheral surface is truly cylindrical about the axis of said cavity.
  • are then cut or milled, as illustrated in Fig. 7, just far enough so that they reach, but do not substantially encroach on what will be the cavity 32 in the magnetron, as shown in Figs. 1 and 2.
  • the slotted blank of Fig. '7 and the segment to form the boss 39 of Fig. 1 are then fitted to the cylindrical shell H, as shown in Fig. 8, to form the assembly illustrated in Fig. 9 supported by a fixture, not shown, and secured in place as by means of BT solder ring or other connecting means I2 running into the space between the outer surface of the blank 61 and the inner surface of the annular member 1
  • the boss segment 39 is back of shell 1 I.
  • the surfaces of the member I I, above and below the surface 13 which is to be connected to the outer surface 14, is desirably slightly cut away or relieved, as indicated at 15 and 16, to facilitate entry of the solder or other connecting medium into the clearance space between the parts. It will be understood that this clearance space need only be very small and that the connection is effected in a hydrogen furnace or other heating means where the parts are prevented from undesired oxidation.
  • the center core is removed as by proper drilling to provide the cavity 32 as shown in Figs. 1, 2 and 10, after Which'the other parts may be assembled, and RT solder applied in the form of wire wound about the desired region for soldering, including the upper and lower copper cover members or plates 11 and 18 as shown in Fig. 2, with RT solder rings applied at the joints and the whole assembly exposed in a hydrogen furnace and brought to the melting temperature of the solder.
  • a magnetron ll consisting of a body or anode portion l2 which, like the magnetron H, is desirably formed of copper and has selenium copper alloy portions [3 M [5%, i6 l1, l8, l9 and 21 projecting inwardly from a peripheral portion 22 and separated by anode cavities or slots 23 2 25 26 21 28 29 and 3H. All of these slots communicate with the central chamber 32 where a cathode may be positioned, as in the first embodiment.
  • each slot is generally rectangular in section or with a pair of opposite walls parallel
  • I have made these anode cavities, slots or pockets generally triangular, trapezoidal or sector shaped in section, that is, diverging outwardly or from the cathode cavity 32 and separated by correspondingly shaped portions projecting inwardly from the peripheral portion 22.
  • the particular divergence of the anode cavities is here obtained by making each anode projection, l3 Id I5 I6 I1 Hi I9 and Zi with straight side walls which, between their inner and outer ends, converge for an appreciable distance.
  • the circumferential length of each slot may be greater or less than that of the separating partitions l3 to 19, inclusive, and Zi depending on the characteristics desired.
  • the magnetron of this embodiment may be formed as described in connection with the first embodiment except that in forming the slots, as shown in Fig. 7, they are made to flare or expand outwardly, rather than of uniform width. This may be effected by using a correspondingly modified milling cutter or by taking two cuts at the desired angle with respect to one another for each slot. Except as specifically described in connection with the present embodiment the same may correspond with that of the first embodiment, except that the output device used on cylindrical cavity type magnetrons would be more appropriate.
  • magnetron 1 l is there illustrated consisting of a body or anode portion i2 or" copper having selenium copper alloy portions E3 14*, [5 I6 ll [8 [9 and 2 l projecting inwardly from the peripheral portion 22 and separated by slots or pockets 23 24 25 26 21 228 5129 and 3: slots communicate with the central chamber 32* where a cathode may be positioned as in the first embodiment, with which this embodiment may correspond except as otherwise specifically described.
  • the portions projecting inwardly from the peripheral portion 22 are all generally thin and of uniform width, like the slots 23 to 29, inclusive, and 3
  • the inner circumferential width of each siot is uniform and may correspond with the uniform inner circumferential width of the separating partitions, notwithstanding the variation in outer circumferential width of these parts, although this correspondence is not essential.
  • One advantage of the embodiments of Figs. 16 and 17, as compared with that of the first embodiment, and especially of the embodiment of Fig. 17, is that magnetrons of lighter weight and greater emciency and power capacity are there- All of these by produced. This is because the impedance of the generally triangular, trapezoidal or sector shaped slot or pocket at the slotaperture is much higher than that of the slot of uniform width of the magnetron of the first embodiment, and hence this slot shape results in a much better match for the electronic field impedance than in the case of the magnetron of the first embodiment.
  • An additional advantage of the trapezoidal slot structure is that the wavelength sensitivity with regard to the structural parameters of the cavity is between that of the rectangular slot and the cylindrical cavity structure.
  • the method of manufacturing magnetrons comprising forming a generally cylindrical body member, cutting therein radial slots from the periphery only partly to the center, to leave outstanding projections, fitting said body member into a hollow cylindrical member, securing said body member projections to said cylindrical member, and removing the center portion of said body member to provide a generally cylindrical center cavity for reception of a cathode assembly, which cavity communicates with radial pockets extending to the hollow cylindrical member.
  • magnetrons comprising forming a generally cylindrical body member with outstanding circumferentiallyspaced generally triangular projections, fitting said body member into a hollow cylindrical member, soldering the engaging peripheral surfaces of said body and cylindrical members, and removing the center portion of said body memberto provide a generally cylindrical center cavity for reception of a cathode assembly, which cavity communicates with radial pockets extending to the hollow cylindrical member.
  • a filtered lead assembly comprising a lead, a casing through which a portion of said lead extends, a tube coaxial with said casing, coaztially surrounding said lead but spaced therefrom and with a portion spaced from said casing, and having an outstanding annular portion directly secured to said casing, and a vitreous closure member united to said annular portion and through which said lead is sealed.
  • a filtered lead assembly comprising a lead, a casing through which a portion of said lead extends, a tube surrounding but spaced from said lead and formed with an outstanding annular flange engaging a shoulder on said casing, a sleeve secured to the outer edge of said casing and holding said flange against said shoulder, and a glass closure member extending from a portion of said lead beyond said sleeve and sealed thereto.
  • a filtered lead assembly comprising a lead, a casing through which a portion of said lead extends, a metal member surrounding but spaced from said lead and comprising hollow cylindrical portions of different diameters united by an intermediate annular portion, means securing said member adjacent said annular portion to said casing, and means closing the outer portion of said metal member comprising a glass sleeve through which the outer portion of said lead projects, the inner portion of said sleeve being sealed to the cylindrical portion of said member of larger diameter.
  • a filtered lead assembly comprising a lead, a casing through which a portion of said lead extends, and a metal member surrounding but spaced from said lead and comprising hollow cylindrical portions of different diameters united by an intermediate annular portion, means securing the portion of larger diameter inside said casing in adjusted position and coaxially therewith, and a glass closure member sealed to the outer edge of said portion of larger diameter and the lead which passes therethrough.
  • a magnetron comprising a housing formed as an outer generally hollow cylindrical portion from which inwardly tapering portions project defining a central cathode cavity from which generally rectangular chambers extend radially, a cathode assembly disposed in said cavity, leads from the cathode assembly projecting through said hollow cylindrical portion to outside of said housing, and a sleeve surrounding but spaced from each lead, providing filters for minimizing loss of power from the housing.
  • a magnetron comprising a housing formed as an outer generally hollow cylindrical portion from which generally triangular portions project inwardly defining a central cathode cavity from which generally rectangular chambers extend radially, a cathode assembly disposed in said cavity, leads from the cathode assembly projecting through said hollow cylindrical portion to outside of said housing, casings surrounding portions of said leads outside of said housing, and a sleeve surrounding but spaced from each lead and with an outstanding portion secured to the co'responding casing, providing filters for minimizing loss of power from the housing.
  • a magnetron comprising a housing formed as an outer generally hollow cylindrical portion from which inwardly tapered portions project defining a central cathode cavity communicating with generally rectangular chambers disposed thereabout, a cathode assembly disposed in said cavity, leads from the cathode assembly projecting through said hollow cylindrical portion to outside of said housing, a terminal lead extending into said housing in a direction generally normal to one of said chambers and with its inner end fixed in a cavity in a wall of said chamber, and a conductive casing projecting from said housing and disposed coaxial with respect to said lead.
  • a magnetron comprising a housing formed as an outer generally hollow cylindrical portion from which inwardly tapered portions project defining a central cathode cavity communicating with generally rectangular chambers disposed thereabout, a cathode assembly disposed in said cavity, leads from the cathode assembly projecting through said hollow cylindrical portion to outside of said housing, a sleeve surrounding but spaced from each lead providing a filter for minimizing loss of power from the housing, a terminal lead extending into said housing in a direction generally normal to one of said chambers and with its inner end fixed in a cavity in a wall of said chamber, and a conductive casing projecting from said housing and disposed coaxial with respect to said lead.
  • a magnetron housing formed as an outer generally cylindrical hollow portion to which inwardly tapering fiat-sided portions project defining a central cathode cavity communicating with pockets sector shaped in cross section and disposed therearound, said cylindrical portion extending axially beyond said fiat-sided portions for connection with cover plates.
  • a magnetron housing formed as an outer generally cylindrical hollow portion of copper to which are attached separately formed fiat-sided selenium copper alloy portions of uniform width which project inward defining a central cathode cavity communicating with pockets sector shaped in cross section and disposed therearound, said cylindrical portion extending axially beyond said fiat-sided portions for connection with cover plates.
  • the method of manufacturing magnetrons comprising forming a generally cylindrical body portion with outstanding circumferentially spaced projections, fitting said body member into a hollow cylindrical member, securing said body member projections to said cylindrical member, and removing the center portion of said body member to provide a generally cylindrical center cavity for reception of a cathode assembly, which cavity communicates with outwardly flaring pockets extending to said hollow cylindrical member.
  • a magnetron comprising a housing formed as an outer generally hollow cylindrical portion from which portions project inwardly defining a central cathode cavity communicating with chambers disposed thereabout, a cathode assembly disposed in said cavity, leads from said cathode assembly projecting through said hollow cylindrical portion to outside of said housing, a terminal lead extending into said housing in a direction normal to the central radial plane of one of said chambers and with its inner end fixed in a cavity in a Wall of said chamber, and a conductor casing projecting from said housing and disposed coaxial with respect to said lead.
  • a magnetron comprising a housing formed as an outer generally hollow cylindrical portion, from which flat sided portions project inwardly defining a central cathode cavity communicating with chambers sector-shaped in cross-section and disposed thereabout, a cathode assembly disposed in said cavity, leads from said cathode assembly projecting through said hollow cylindrical portion to outside of said housing, a terminal lead extending into said housing in a direction normal to the central radial plane of one of said chambers and with its inner end fixed in a cavity in a wall of said chamber, and a conductor casing projecting from said housing and disposed coaxial with respect to said lead.
  • a magnetron housing comprising a hollow cylindrical portion of oxygen-free high-conductivity copper from which flat-sided walls of selenium copper alloy project inward in generally radial directions defining a central cathode cavity communicating with pockets disposed therearound.
  • a magnetron housing comprising a hollow cylindrical copper portion, a plurality of flatsided walls of selenium copper alloy encircled thereby axially, shorter than said cylindrical portion, and projecting from the inner surface thereof in generally radial directions defining a central cathode cavity communicating with pockets disposed therearound, and cover members secured to the axially projecting edge portions of said cylindrical portion.
  • a filtered lead assembly comprising a lead, a shouldered casing through which a portion of said lead extends, and a tube coaxial with said casing, surrounding but spaced from said lead, with an annular portion outstanding from the outer end portion of said tube, in a plane transverse to its axis, and engaging and secured to the shouldered portion of said casing.

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  • Manufacturing & Machinery (AREA)
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US460376A 1942-10-01 1942-10-01 Magnetron and method of manufacture Expired - Lifetime US2564716A (en)

Priority Applications (11)

Application Number Priority Date Filing Date Title
BE474540D BE474540A (hu) 1942-10-01
BE473775D BE473775A (hu) 1942-10-01
NL68027D NL68027C (hu) 1942-10-01
US460376A US2564716A (en) 1942-10-01 1942-10-01 Magnetron and method of manufacture
US462132A US2520955A (en) 1942-10-01 1942-10-15 Trapezoidal cavity magnetron
GB7535/47A GB636005A (en) 1942-10-01 1947-03-19 Improvements in or relating to electron discharge devices
GB8102/47A GB646704A (en) 1942-10-01 1947-03-25 Improvements in or relating to electron discharge devices
CH271573D CH271573A (de) 1942-10-01 1947-04-24 Magnetron.
CH262105D CH262105A (de) 1942-10-01 1947-04-24 Magnetron und Verfahren zur Herstellung desselben.
FR988427D FR988427A (fr) 1942-10-01 1947-07-11 Magnétron et procédé de fabrication de celui-ci
FR57617D FR57617E (fr) 1942-10-01 1947-07-12 Magnétron et procédé de fabrication de celui-ci

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US460376A US2564716A (en) 1942-10-01 1942-10-01 Magnetron and method of manufacture

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US2564716A true US2564716A (en) 1951-08-21

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US460376A Expired - Lifetime US2564716A (en) 1942-10-01 1942-10-01 Magnetron and method of manufacture

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US (1) US2564716A (hu)
BE (1) BE473775A (hu)
CH (1) CH262105A (hu)
FR (2) FR988427A (hu)
GB (1) GB636005A (hu)
NL (1) NL68027C (hu)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2749477A (en) * 1951-04-05 1956-06-05 Hartford Nat Bank & Trust Co Cavity-resonator magnetron
US2836764A (en) * 1952-01-29 1958-05-27 Raytheon Mfg Co Magnetron output coupling devices
US2850671A (en) * 1952-01-24 1958-09-02 Raytheon Mfg Co Magnetron amplifiers
US2946918A (en) * 1950-12-18 1960-07-26 Litton Industries Inc Magnetron output coupling circuit

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2212323A (en) * 1987-11-12 1989-07-19 English Electric Valve Co Ltd Magnetron anodes

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2063342A (en) * 1934-12-08 1936-12-08 Bell Telephone Labor Inc Electron discharge device
US2128235A (en) * 1934-10-11 1938-08-30 Meaf Mach En Apparaten Fab Nv Vacuum discharge tube
GB509102A (en) * 1937-10-08 1939-07-11 Electricitatsgesellschaft Sani Improvements in vacuum electric discharge apparatus
US2216169A (en) * 1939-03-21 1940-10-01 Roscoe H George Oscillator
CH215600A (de) * 1938-08-12 1941-06-30 Bbc Brown Boveri & Cie Anordnung mit einer Magnetronröhre.
US2270777A (en) * 1939-04-06 1942-01-20 Telefunken Gmbh Ultra short wave electron discharge device system
US2304186A (en) * 1939-12-14 1942-12-08 Int Standard Electric Corp Velocity modulated tube
US2411151A (en) * 1942-05-01 1946-11-19 Bell Telephone Labor Inc Output coupling for high-frequency oscillators
US2411601A (en) * 1941-09-30 1946-11-26 Raytheon Mfg Co Electronic discharge device

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2128235A (en) * 1934-10-11 1938-08-30 Meaf Mach En Apparaten Fab Nv Vacuum discharge tube
US2063342A (en) * 1934-12-08 1936-12-08 Bell Telephone Labor Inc Electron discharge device
GB509102A (en) * 1937-10-08 1939-07-11 Electricitatsgesellschaft Sani Improvements in vacuum electric discharge apparatus
CH215600A (de) * 1938-08-12 1941-06-30 Bbc Brown Boveri & Cie Anordnung mit einer Magnetronröhre.
US2216169A (en) * 1939-03-21 1940-10-01 Roscoe H George Oscillator
US2270777A (en) * 1939-04-06 1942-01-20 Telefunken Gmbh Ultra short wave electron discharge device system
US2304186A (en) * 1939-12-14 1942-12-08 Int Standard Electric Corp Velocity modulated tube
US2411601A (en) * 1941-09-30 1946-11-26 Raytheon Mfg Co Electronic discharge device
US2411151A (en) * 1942-05-01 1946-11-19 Bell Telephone Labor Inc Output coupling for high-frequency oscillators

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2946918A (en) * 1950-12-18 1960-07-26 Litton Industries Inc Magnetron output coupling circuit
US2749477A (en) * 1951-04-05 1956-06-05 Hartford Nat Bank & Trust Co Cavity-resonator magnetron
US2850671A (en) * 1952-01-24 1958-09-02 Raytheon Mfg Co Magnetron amplifiers
US2836764A (en) * 1952-01-29 1958-05-27 Raytheon Mfg Co Magnetron output coupling devices

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FR988427A (fr) 1951-08-27
CH262105A (de) 1949-06-15
GB636005A (en) 1950-04-19
NL68027C (hu)
FR57617E (fr) 1953-03-17
BE473775A (hu)

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