US2189261A - Cathode-ray tube and the like - Google Patents

Cathode-ray tube and the like Download PDF

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Publication number
US2189261A
US2189261A US150906A US15090637A US2189261A US 2189261 A US2189261 A US 2189261A US 150906 A US150906 A US 150906A US 15090637 A US15090637 A US 15090637A US 2189261 A US2189261 A US 2189261A
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Prior art keywords
glass
cathode
metal
ray tube
flare
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Expired - Lifetime
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US150906A
Inventor
Robert M Bowie
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Hygrade Sylvania Corp
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Hygrade Sylvania Corp
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Filing date
Publication date
Priority to US99384A priority Critical patent/US2194418A/en
Application filed by Hygrade Sylvania Corp filed Critical Hygrade Sylvania Corp
Priority to US150906A priority patent/US2189261A/en
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Publication of US2189261A publication Critical patent/US2189261A/en
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Classifications

    • 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
    • H01J29/86—Vessels; Containers; Vacuum locks
    • H01J29/861—Vessels or containers characterised by the form or the structure thereof
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B11/00—Pressing molten glass or performed glass reheated to equivalent low viscosity without blowing
    • C03B11/06—Construction of plunger or mould
    • C03B11/10—Construction of plunger or mould for making hollow or semi-hollow articles
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B11/00—Pressing molten glass or performed glass reheated to equivalent low viscosity without blowing
    • C03B11/14—Pressing laminated glass articles or glass with metal inserts or enclosures, e.g. wires, bubbles, coloured parts
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B23/00—Re-forming shaped glass
    • C03B23/0073—Re-forming shaped glass by blowing
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B23/00—Re-forming shaped glass
    • C03B23/20—Uniting glass pieces by fusing without substantial reshaping
    • C03B23/207—Uniting glass rods, glass tubes, or hollow glassware
    • C03B23/217—Uniting glass rods, glass tubes, or hollow glassware for the production of cathode ray tubes or similarly shaped tubes
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C27/00—Joining pieces of glass to pieces of other inorganic material; Joining glass to glass other than by fusing
    • C03C27/02—Joining pieces of glass to pieces of other inorganic material; Joining glass to glass other than by fusing by fusing glass directly to metal
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J5/00—Details relating to vessels or to leading-in conductors common to two or more basic types of discharge tubes or lamps
    • H01J5/20—Seals between parts of vessels
    • 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
    • H01J9/24—Manufacture or joining of vessels, leading-in conductors or bases
    • H01J9/244—Manufacture or joining of vessels, leading-in conductors or bases specially adapted for cathode ray tubes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/0033—Vacuum connection techniques applicable to discharge tubes and lamps
    • H01J2893/0037—Solid sealing members other than lamp bases
    • 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
    • Y10T403/00—Joints and connections
    • Y10T403/47—Molded joint
    • Y10T403/477—Fusion bond, e.g., weld, etc.

Definitions

  • This invention relates to cathode-ray tubes and more particularly to cathode ray tubes of the composite metal-glass type.
  • An object of the invention is to provide an improved cathode-ray tube of the typehaving a composite metal-glass flare portion.
  • this flared portion be of comparatively large diameter, especially in the larger tubes where even the reduced end of the metal part of the envelope may be of the order of several inches in diameter.
  • the reduced end of the metal part of the envelope camby ordinary methods, be made to very accurate dimensions, the same is not true of the manufacture of the co-operating flared end of the glass neck portion.
  • methods of flaring a glass tube to a relatively large diameter are well-known, I have foundthat these methods are not suitable for use in forming the flared portion of the tube neck.
  • these usual methods of flaring aglass tube to large diameters are slow and highly accurate dimensions cannot be produced with sufficient uniformity and reliability to warrant their use in quantity production of large cathode-ray tubes.
  • Another feature relates to the novel organization, arrangement and relative location of partsv which constitute an improved composite metalglass cathode-ray tube envelope.
  • Fig. 1 is a schematic sectional view of a device to explain the method of form ing certain parts of a cathode-ray tube envelope according to the invention.
  • Fig. 2 is a sectional view to illustrate another step in the formation of the cathode-ray tube envelope.
  • Fig. 3 is a view of the completed cathode-ray tube made in accordance with the invention.
  • the oathode-ray tube envelope is of the composite metalglass type and comprises a substantially flat end wall I of glass or similar vitreous material having its interior face coated with suitable fluorescent material (not shown).
  • the envelope comprises an elongated conical portion 2 of steel or other suitable metal.
  • the neck portion of the envelope comprises 'a substantially cylindrical glass tubular portion 3 terminating at its left-hand end in an enlarged flare I. Inasmuch as it is not practical to form a vacuum-tight seal between the,
  • the flare l is of Coming 705 AJ glass
  • the ring 5 is of "Kovar an alloy consisting of approximately 18% cobalt, 28% nickel and 54% iron.
  • the metal portions 2 and 5 are of rigid metal and in orderto-effect a proper vacuum-tight seal between members 4 and 5 it is necessary that the mouth of the flare ,be of accurate diameter. I have found that the ordinary methods of flaring a glass tube and uniting it to a metal ring are not suitable for use in cathode-ray tubes of'the type described, either because of the time re-.
  • the numeral 8 represents schematically a suitable mold having a frustoconical mold cavity terminating at its bottom in a reduced cylindrical cavity.
  • the mouth of the conical cavity is provided with a raised rim 9 for the purposes about to be described.
  • the metal ring 5 is seated on the rim of the mold as shown,
  • the clamping ring II is placed in position to hold the ring 5 rigidly in place.
  • a gather or ball'of molten glass preferably at white heat is then allowed to fall into the mold cavity and immediately thereafter the plunger I2 is lowered to force the liquid glass upward until it engages the edge of ring 5 and flows therearound as shown.
  • the head of the plunger I2 is shaped complementary to the mold cavity so that when said plunger is in its lowermost posisaid edge has been previously oxidized in any wellknown manner.
  • composite metal-glass assembly consisting of an accurately dimensioned frusto-conical glass part sealed in a vacuum-tight manner to the Kovar ring 5.
  • the annealed assembly is mounted in a suitable air-tight jig such for example as shown in Fig. 2 comprising a rotatable head l4 and a clamping ring l5, adapted to be held in place by suitable springs IS.
  • the hub I1 is provided with a passage-way l8 leading to a blowing hose for purposes to be described.
  • the glass blower then heats the end to .softenit, and at the proper instant he blows through passage I8 to blow the end 20 to a bubble which can then be broken on.
  • the edge I9 is straightened and smoothed to the proper diameter, while the said part I9 is still within the softening flame.
  • a suitable length of glass tubing 3 is then placed in axial alignment with the end l9 and the two are sealed together in the manner well-known in the glass blowing 811).
  • theclamp I5 is removed and the assembly comprising elements 3,1 and 5 is united to the metal member 2.
  • the rim of ring 5 is welded to the reduced end of member 2 to form a vacuum-tight seal therewith.
  • the finished composite metalglass envelope is then ready to receive the electrode assembly or mount.
  • the glass end I may be sealed to the metal member 2 either before or after the union of parts 2 and 5 as above-described.
  • the parts 2 and 5 may be welded-togetherv as a unit prior to sealing thereto the glass flare as above-described.
  • the mold will be provided with a suitable clamping member to hold the parts rigidly in place during the pressure on the glass "gather" in the mold as described.
  • a cathode-ray tube having a main funnelshaped body portion of metal, an elongated cylindrical glass neck joined to a composite glassmetal flare said flare comprising a frusto-conical glass section and a metal sealing ring with a corresponding frusto-conical section, said sealing ring being of a metal different from that of said body portion and sealed to the glass section in a vacuum-tight manner, the parts of said composite flare being preformed and sealed together as a separate unit from the remainder of the tube, a vacuum-tight weld between said ring and the constricted end of said body portion, a glass window sealed in a vacuum-tight manner to-the enlarged end of said body portion, and ray deflecting means adjacent the glass section of said composite flare.
  • a cathode-ray tube according to claim 1 in which the glass section of the composite flare and the metal sectionthereof have substantially the same angular opening.
  • a cathode-ray tube in which said main metal body portion has a cylindrical dollar at its narrow end and said sealing ring has a cylindrical portion welded to said collar and a frusto-conical portion sealed into the corresponding frusto-conical glass section of the composite flare.
  • a composite metal-glass flare unit for joining an elongated glass neck to the metal body section of a cathode-ray tube which glass neck has a difierent coeilicient of expansion from that of said metal body section comprising a metal ring having a preformed frusto-conical section sealed in a vacuum-tight manner to a preformed corresponding frusto-conical glass section, said ring and glass section being formed as a separate unit and having substantially the same expansion coeflicient.
  • a cathode-ray tube having a main body portion of metal, an elongated cylindrical glass neck joined to a composite glass-metal flare said flare comprising a frusto-conical glass section and a metal sealing ring with a corresponding frustoconical section, said sealing ring being of a metal different from that of said body portion but having the same expansion coeflicient as said glass section, whereby it is sealed to the glass section in a vacuum-tight manner, the parts of said composite flare being preformed and sealed together as a separate unit from said cylindrical glass neck and the remainder of the tube, a vacuum-tight weld between said ring and the constricted end of said body portion, a closure member sealed in a vacuum-tight'manner to the enlarged end of said body portion, and ray deflecting means adjacent the glass section of said composite flare.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Ceramic Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)

Description

CATHODE RAY TUBE AND THE LIKE Original Filed Sept. 4, 1936 H TiTl.
Zhwentor Patented Feb. 6, I940 UNITED STATES PATENT OFFICE 2,189,281 CATHODE-RAY TUBE AND THE LIKE Original application stpkmbel' 4. 1936. Serial No.
6 Claims.
This invention relates to cathode-ray tubes and more particularly to cathode ray tubes of the composite metal-glass type.
An object of the invention is to provide an improved cathode-ray tube of the typehaving a composite metal-glass flare portion.
In cathode-ray tubes of the type wherein the end of the neck pOrtionQit is requisite that this flared portion be of comparatively large diameter, especially in the larger tubes where even the reduced end of the metal part of the envelope may be of the order of several inches in diameter. While the reduced end of the metal part of the envelopecamby ordinary methods, be made to very accurate dimensions, the same is not true of the manufacture of the co-operating flared end of the glass neck portion. While methods of flaring a glass tube to a relatively large diameter are well-known, I have foundthat these methods are not suitable for use in forming the flared portion of the tube neck. Furthermore these usual methods of flaring aglass tube to large diameters, are slow and highly accurate dimensions cannot be produced with sufficient uniformity and reliability to warrant their use in quantity production of large cathode-ray tubes.
Accordingly it is aprincipal feature of the present invention to provide a composite metalglass cathode-ray tube envelope, which is suited to quantity production, and wherein the flared neck portion of the tube can be made with a very high degree of accuracy and uniformity.
Another feature relates to the novel organization, arrangement and relative location of partsv which constitute an improved composite metalglass cathode-ray tube envelope.
Other features and advantages not specifically enumerated will be apparent after a consideration of the following detailed descriptions and the appended claims.
In the drawing, Fig. 1 is a schematic sectional view of a device to explain the method of form ing certain parts of a cathode-ray tube envelope according to the invention.
Fig. 2 is a sectional view to illustrate another step in the formation of the cathode-ray tube envelope.
Divided and this application June 29, 1937, Serial No. 150,906
Fig. 3 is a view of the completed cathode-ray tube made in accordance with the invention.
Referring more particularly to Fig. 3, the oathode-ray tube envelope is of the composite metalglass type and comprises a substantially flat end wall I of glass or similar vitreous material having its interior face coated with suitable fluorescent material (not shown). The envelope comprises an elongated conical portion 2 of steel or other suitable metal. The neck portion of the envelope comprises 'a substantially cylindrical glass tubular portion 3 terminating at its left-hand end in an enlarged flare I. Inasmuch as it is not practical to form a vacuum-tight seal between the,
metal 2 and the glass 3, there is interposed a frusto-conical ring 5 of a metal which has the same coeflicient of expansion as the glass 4. Preferably the flare l is of Coming 705 AJ glass, and the ring 5 is of "Kovar an alloy consisting of approximately 18% cobalt, 28% nickel and 54% iron. After the parts I to i-have been assembled as described hereinbelow, the envelope has mounted therein the usual electrode assembly, and the tube is then exhausted and processed according to known procedure. After the tube has been processed and sealed-off, it may have fastened thereto a contact base 6 with appropriate contact prongs 1.
As, will be seen from the foregoing description, the metal portions 2 and 5 are of rigid metal and in orderto-effect a proper vacuum-tight seal between members 4 and 5 it is necessary that the mouth of the flare ,be of accurate diameter. I have found that the ordinary methods of flaring a glass tube and uniting it to a metal ring are not suitable for use in cathode-ray tubes of'the type described, either because of the time re-.
quired to effect the proper seal, or because of the lack of reliability or uniformity in the seal.
- Iv have also found that by employing a special pressure molding operation it is possible to overcome the above-noted disadvantages, and as a result relatively large composite metal-glass cathode-ray tube envelopes can be made comparatively economically and with accurate dimensions.
Referring toFig. 1 a description will now be given of the manner of simultaneously-forming the flare 4 and sealing it in a vacuum-tight manner'to ring 5. In Fig. 1 the numeral 8 represents schematically a suitable mold having a frustoconical mold cavity terminating at its bottom in a reduced cylindrical cavity. The mouth of the conical cavity is provided with a raised rim 9 for the purposes about to be described. The metal ring 5 is seated on the rim of the mold as shown,
so that the lower edge of the frusto-conical portion l0- extendsinto the mold cavity beyond the rim 9 thus providing a slight clearance between the said edge and the face of the mold cavity.
The clamping ring II is placed in position to hold the ring 5 rigidly in place. A gather or ball'of molten glass preferably at white heat is then allowed to fall into the mold cavity and immediately thereafter the plunger I2 is lowered to force the liquid glass upward until it engages the edge of ring 5 and flows therearound as shown. It will be noted that the head of the plunger I2 is shaped complementary to the mold cavity so that when said plunger is in its lowermost posisaid edge has been previously oxidized in any wellknown manner. There is thus formed composite metal-glass assembly consisting of an accurately dimensioned frusto-conical glass part sealed in a vacuum-tight manner to the Kovar ring 5.
After the composite metal-glass assembly has cooled sufliciently in the .mold, whereupon it may be removed and annealed in any well known manner. The annealed assembly is mounted in a suitable air-tight jig such for example as shown in Fig. 2 comprising a rotatable head l4 and a clamping ring l5, adapted to be held in place by suitable springs IS. The hub I1 is provided with a passage-way l8 leading to a blowing hose for purposes to be described. With the assembly as I shown in Fig. 2 set in rotation, the glass blower then heats the end to .softenit, and at the proper instant he blows through passage I8 to blow the end 20 to a bubble which can then be broken on. By means of a carbon rod or paddle the edge I9 is straightened and smoothed to the proper diameter, while the said part I9 is still within the softening flame. A suitable length of glass tubing 3 is then placed in axial alignment with the end l9 and the two are sealed together in the manner well-known in the glass blowing 811).
-When the joining of the cylindrical glass neck portion 3 has been completed, theclamp I5 is removed and the assembly comprising elements 3,1 and 5 is united to the metal member 2. Preferably the rim of ring 5 is welded to the reduced end of member 2 to form a vacuum-tight seal therewith. The finished composite metalglass envelope is then ready to receive the electrode assembly or mount.
It will be understood of course that the glass end I may be sealed to the metal member 2 either before or after the union of parts 2 and 5 as above-described. Likewise the parts 2 and 5 may be welded-togetherv as a unit prior to sealing thereto the glass flare as above-described. In this latter case the mold will be provided with a suitable clamping member to hold the parts rigidly in place during the pressure on the glass "gather" in the mold as described.
Other modifications may be made inthe method described, without departing fromthe spirit and scope of the invention. For a detailed disclosure of preferred forms of electron guns, control electrodes, and deflecting means that may be used with the tube as described, reference may be had to application Serial No. 95,970, filed August 14, 1936.
This application is a division of application Serial No. 99,384, filed September 4, 1936.
What I claim is:
1. A cathode-ray tube having a main funnelshaped body portion of metal, an elongated cylindrical glass neck joined to a composite glassmetal flare said flare comprising a frusto-conical glass section and a metal sealing ring with a corresponding frusto-conical section, said sealing ring being of a metal different from that of said body portion and sealed to the glass section in a vacuum-tight manner, the parts of said composite flare being preformed and sealed together as a separate unit from the remainder of the tube, a vacuum-tight weld between said ring and the constricted end of said body portion, a glass window sealed in a vacuum-tight manner to-the enlarged end of said body portion, and ray deflecting means adjacent the glass section of said composite flare.
2. A cathode-ray tube according to claim 1 in which the glass section of the composite flare and the metal sectionthereof have substantially the same angular opening.
3. A cathode-ray tube according to claim 1 in which the said sealing ring has a frusto-conical flare portion where it is sealed to the corresponding frusto-conical glass section of the composite flare.
4. A cathode-ray tube according to claim 1 in which said main metal body portion has a cylindrical dollar at its narrow end and said sealing ring has a cylindrical portion welded to said collar and a frusto-conical portion sealed into the corresponding frusto-conical glass section of the composite flare.
5. A composite metal-glass flare unit for joining an elongated glass neck to the metal body section of a cathode-ray tube which glass neck has a difierent coeilicient of expansion from that of said metal body section comprising a metal ring having a preformed frusto-conical section sealed in a vacuum-tight manner to a preformed corresponding frusto-conical glass section, said ring and glass section being formed as a separate unit and having substantially the same expansion coeflicient.
6. A cathode-ray tube having a main body portion of metal, an elongated cylindrical glass neck joined to a composite glass-metal flare said flare comprising a frusto-conical glass section and a metal sealing ring with a corresponding frustoconical section, said sealing ring being of a metal different from that of said body portion but having the same expansion coeflicient as said glass section, whereby it is sealed to the glass section in a vacuum-tight manner, the parts of said composite flare being preformed and sealed together as a separate unit from said cylindrical glass neck and the remainder of the tube, a vacuum-tight weld between said ring and the constricted end of said body portion, a closure member sealed in a vacuum-tight'manner to the enlarged end of said body portion, and ray deflecting means adjacent the glass section of said composite flare. I
ROBERT M. BOWIE.
US150906A 1936-09-04 1937-06-29 Cathode-ray tube and the like Expired - Lifetime US2189261A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US99384A US2194418A (en) 1936-09-04 1936-09-04 Method of making a cathode-ray tube envelope
US150906A US2189261A (en) 1936-09-04 1937-06-29 Cathode-ray tube and the like

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Application Number Priority Date Filing Date Title
US99384A US2194418A (en) 1936-09-04 1936-09-04 Method of making a cathode-ray tube envelope
US150906A US2189261A (en) 1936-09-04 1937-06-29 Cathode-ray tube and the like

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2415349A (en) * 1940-09-05 1947-02-04 Harries John Henry Owen Electron discharge tube for ultra high frequencies
US2466329A (en) * 1946-08-02 1949-04-05 Cinema Television Ltd Partitioned projection cathode-ray tube
US2503813A (en) * 1949-01-27 1950-04-11 Richard A Fisch Insulated shield for metal backed television tubes
US2514878A (en) * 1947-06-12 1950-07-11 Hartford Nat Bank & Trust Co Electron discharge tube alignment means and method of aligning
US2585614A (en) * 1950-12-29 1952-02-12 Rauland Corp Metal cone cathode-ray tube
US2663012A (en) * 1952-01-30 1953-12-15 John R Beers Projection television tube
US2682963A (en) * 1949-10-08 1954-07-06 Rca Corp Metal cone for cathode-ray tubes
US2691457A (en) * 1949-11-30 1954-10-12 Sylvania Electric Prod Cathode-ray tube envelope
US2753073A (en) * 1949-12-15 1956-07-03 Rca Corp Seal for composite cathode ray tubes
US5471111A (en) * 1992-12-15 1995-11-28 Samsung Electron Devices Co., Ltd. Liquid cooling type projection cathode ray tube
US5521459A (en) * 1992-12-15 1996-05-28 Samsung Electron Devices Co., Ltd. Liquid cooling type projection cathode ray tube

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2448808A (en) * 1945-05-02 1948-09-07 Du Mont Allen B Lab Inc Contact terminal for vacuum tubes
US2767466A (en) * 1945-10-08 1956-10-23 Rca Corp Method of making metal cones for cathode ray tubes
US2657320A (en) * 1948-12-30 1953-10-27 Bell Telephone Labor Inc Piezoelectric crystal unit
US2782953A (en) * 1950-03-13 1957-02-26 Du Mont Allen B Lab Inc Rectangular metal cathode ray tube
US2759252A (en) * 1951-09-26 1956-08-21 Hartford Nat Bank & Trust Co Method for sealing an iron member to a glass part

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2415349A (en) * 1940-09-05 1947-02-04 Harries John Henry Owen Electron discharge tube for ultra high frequencies
US2466329A (en) * 1946-08-02 1949-04-05 Cinema Television Ltd Partitioned projection cathode-ray tube
US2514878A (en) * 1947-06-12 1950-07-11 Hartford Nat Bank & Trust Co Electron discharge tube alignment means and method of aligning
US2503813A (en) * 1949-01-27 1950-04-11 Richard A Fisch Insulated shield for metal backed television tubes
US2682963A (en) * 1949-10-08 1954-07-06 Rca Corp Metal cone for cathode-ray tubes
US2691457A (en) * 1949-11-30 1954-10-12 Sylvania Electric Prod Cathode-ray tube envelope
US2753073A (en) * 1949-12-15 1956-07-03 Rca Corp Seal for composite cathode ray tubes
US2585614A (en) * 1950-12-29 1952-02-12 Rauland Corp Metal cone cathode-ray tube
US2663012A (en) * 1952-01-30 1953-12-15 John R Beers Projection television tube
US5471111A (en) * 1992-12-15 1995-11-28 Samsung Electron Devices Co., Ltd. Liquid cooling type projection cathode ray tube
US5521459A (en) * 1992-12-15 1996-05-28 Samsung Electron Devices Co., Ltd. Liquid cooling type projection cathode ray tube

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