US3679284A - Method for filling an evacuated electron tube with gas to atmospheric pressure - Google Patents

Method for filling an evacuated electron tube with gas to atmospheric pressure Download PDF

Info

Publication number
US3679284A
US3679284A US3679284DA US3679284A US 3679284 A US3679284 A US 3679284A US 3679284D A US3679284D A US 3679284DA US 3679284 A US3679284 A US 3679284A
Authority
US
United States
Prior art keywords
tubulation
chamber
cut
tube
gas
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
Inventor
Earle Solomon Thall
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.)
RCA Licensing Corp
Original Assignee
RCA 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
Application filed by RCA Corp filed Critical RCA Corp
Application granted granted Critical
Publication of US3679284A publication Critical patent/US3679284A/en
Assigned to RCA LICENSING CORPORATION, TWO INDEPENDENCE WAY, PRINCETON, NJ 08540, A CORP. OF DE reassignment RCA LICENSING CORPORATION, TWO INDEPENDENCE WAY, PRINCETON, NJ 08540, A CORP. OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: RCA CORPORATION, A CORP. OF DE
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • H01J9/50—Repairing or regenerating used or defective discharge tubes or lamps
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/0072—Disassembly or repair of discharge tubes
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/82—Recycling of waste of electrical or electronic equipment [WEEE]

Definitions

  • the novel method includes scribing or otherwise making a circumferential cut on the glass exhaust tubulation of an electron tube, positioning the tubulation inside a close-fitting, closed chamber, cracking the tubulation on the cut, and slowly filling the tube with gas at a low rate of inflow to atmospheric pressure.
  • the exhaust tubulation of the tube is placed in a small close-fitting, closed chamber containing a small internal gas volume.
  • a close-fitting, closed chamber having a minimum volume, no substantial inrush of gas occurs upon opening the tube in the chamber, and there is no requirement to evacuate the chamber to prevent an initial inrush ofgas.
  • the novel process provides for opening the tube by cracking the tubulation on a previously prepared cut. By cracking the tubulation on the cut, a minimal quantity of glass particles is formed, By cracking the tubulation inside the close-fitting chamber, particles are not swept inside the tube from the initial inrush of gas, thereby avoiding blocking of the mask apertures and particle contamination.
  • This novel process permits cost reduction in opening of evacuated tubes for repair by obviating the need for evacuation equipment, an evacuated chamber, or a gas filled chamber, resulting in more economical rebuilding of electron tubes.
  • the novel apparatus includes a means for cracking the tubulation comprising a closed chamber having a flexible portion and a solid portion.
  • the flexible portion seals over the tubulation, and the solid portion fits over the tubulation substantially conforming and closely spaced from the tubulation.
  • the apparatus includes a means to fill the tube chamber at a substantially low rate of inflow to atmospheric air pressure.
  • the novel apparatus is of a simple structure, which is economical to operate and maintain.
  • FIG. 1 is a sectional elevational view of a scribing assembly used in practicing the novel method.
  • FIG. 2 is an elevational view, partially in broken sections, of a tubefilling assembly used in practicing the novel method.
  • FIG. 3 is a flow diagram showing the steps of the novel method.
  • FIG. 1 and FIG. 2 include the bottom portion of an electron tube 10 (partially shown) having a glass envelope 1] including a neck 12, stem leads 13, and glass exhaust tubulation 14 with tipoff 15 positioned in apparatus for opening the tube 10 to air at atmospheric pressure.
  • the apparatus shown in FIG. 1 is a tubulation-scribing assembly 16.
  • the scribing assembly 16 includes a handle 17 having a handle hole 18 in one end slightly larger than the maximum diameter of the tubulation 14.
  • a cutting tool 19 having a cutting point 20 extends through the handle 17 in a radial hole 21.
  • the scribing assembly 16 includes a means for radially moving the cutting tool 19 in the radial hole 21 comprising a spring 22 attached between the cutting tool 19 and the handle 17 and a collar 23 mounted over the handle 17 having a spring adjustment 24 in contact with the spring 22.
  • the col lar 23 also slides axially on the handle 17 to act as an adjustable stop when against the stem leads 13.
  • a tube-filling assembly 25 includes a small, close-fitting hermetic chamber 26 formed by a flexible tubular portion 27 and a cylindrical rigid portion 28.
  • the flexible portion 27 has a slightly smaller inner diameter than the outer diameter of the tubulation 14.
  • One end of the flexible portion 27 is stretched to fit over the tubulation 27, and the other end is stretched to fit over the rigid portion 28.
  • the rigid portion 28 has an axial hole 29 in one end of slightly larger diameter than the maximum diameter of the tubulation 14.
  • the diameter of the tubulation 14 is in the range of 0.349 0.365 inch
  • the inner diameter of the flexible portion 27 is approximately one-fourth inch
  • the wall thickness of the flexible portion 27 is approximately onesixteenth inch
  • the diameter of the axial hole 29 is approximately three-eighths inch.
  • the flexible portion 27 may be a rubber or plastic tubing.
  • the preferred tubing is marketed by U.S. Stoneware Inc., Akron, Ohion, under the trade name tygon" flexible plastic tubing.
  • a needle valve 30 having a flowcontrol knob 31 is attached to the other end of the rigid portion 28.
  • An axial passage 32 connects the axial hole 29 and the needle valve 30.
  • An air filter 33 is connected onthe other end of the needle valve 30.
  • FIG. 3 The tubulation-scribing assembly 16 shown in FIG. 1 is positioned with the handle hole 18 over the tubulation 14, the collar 23 in contact with the end of the stem leads l3, and the cutting point against the side of the tubulation 14.
  • the spring adjustment 24 is then rotated to apply pressure on the spring 22 to maintain the cutting point 20 in contact with the side of the tubulation 14.
  • the scribing assembly I6 is then rotated, making a circumferential cut 34 on the outer surface of the tubulation 14. It is preferred that the circumferential cut 34 be about half way the length of the tubulation 14.
  • the scribing assembly 16 is removed from the tubulation l4, and the filling assembly 25 is placed over the tubulation 14, as shown in FIG. 2, with the tubulation 14 positioned in the chamber 26.
  • the axial hole 29 in the rigid portion 28 fits over the tubulation l4 enclosing the tubulation 14 between the cut 34 and the tipoff 15.
  • the flexible portion 27 fits over the tubulation 14, between the cut 34 and the neck 12, sealing against the tubulation 14, making the chamber 26 airtight.
  • the open end of the flexible portion 27 also contacts the end of the neck 12 to position the end of the rigid portion 28 approximately aligned with or slightly below the cut 34.
  • the tubulation 14 With the tubulation 14 in the chamber 26 and the needle valve 30 closed, the tubulation 14 is cracked at the cut 34 by supporting the tube and applying a traverse pressure on the tube-filling assembly as shown by the direction arrow 35. This traverse pressure moves the filling assembly 25 to the position 36 (shown in phantom), which cracks the tubulation l4 completely through at the cut 34.
  • the tube Since the tube is opened only to a small, close-fitting her metic chamber, substantially no inrush of air occurs. In addition, by cracking on the previously prepared cut 34, a minimum number of particles are created.
  • the needle valve is then opened by rotating the knob 31 to slowly admit air into the chamber 26 and tube, subsequently filling the tube 10 with air to atmospheric pressure.
  • the needle valve 30 is adjusted to slowly bleed air into the tube 10 and chamber 26 at a low inflow rate to atmospheric pressure. It is preferred that the inflow for a 25-inch color-picture tube fill the tube with air in 30 minutes minimum, and preferably longer to prevent particles from being swept inside the tube 10.
  • a method for opening to a gas at atmospheric pressure an evacuated electron tube including an envelope having a glass exhaust tubulation with tipoff projecting therefrom comprising the steps of:
  • said chamber includes a flexible portion and a rigid portion, said flexible portion sealing with said tubulation between said cut and said glass envelope, and said rigid portion enclosing and substantially conforming to and spaced from said tabulation between said out and said tipofi", and said cracking step comprises applying a traverse pressure on said rigid portion, said flexible portion distorting to remain sealed with said tubulation.

Abstract

Method includes scribing a circumferential cut on the glass exhaust tubulation of an electron tube, positioning the tubulation inside a close-fitting, closed chamber, cracking the tubulation on the cut, and slowly filling the chamber and tube with gas at a low rate of inflow to atmospheric pressure. Apparatus includes a close-fitting, closed chamber having a flexible portion that seals over the tubulation, a solid portion that closely fits over the tubulation, and a means to fill the tube and chamber with gas at a low rate of inflow to atmospheric pressure.

Description

United States Patent Thall [54] METHOD FOR FILLING AN EVACUATED ELECTRON TUBE WITH GAS TO ATMOSPHERIC PRESSURE [72] Inventor: Earle Solomon Thall, Waverly, Pa.
[451 July 25,1972
3,316,685 5/1967 Hansel ..29/413 X 3,390,033 6/1968 Brown ...29/427 X 3,404,933 10/1968 Weideman ..316/2 Primary ExaminerJohn F. Campbell Assistant ExaminerRichard Bernard Lazarus Attorney-Glenn l-l. Bruestle ABSTRACT Method includes scribing a circumferential cut on the glass exhaust tubulation of an electron tube, positioning the tubulation inside a close-fitting, closed chamber, cracking the tubulation on the cut, and slowly filling the chamber and tube with gas at a low rate of inflow to atmospheric pressure. Apparatus includes a close-fitting, closed chamber having a flexible portion that seals over the tubulation, a solid portion that closely fits over the tubulation, and a means to fill the tube and chamber with gas at a low rate of inflow to atmospheric pressure.
3 Claims, 3 Drawing Figures PATENTEDJHLZS m2 SCRIBE CIRCUMFERENTIAL CUT ON TUBULATION POSITION TUBULATION v IN CLOSE FITTING CLOSED CHAMBER lNVEN'TOR. Earle 8. Thall BY ATTORNEY CRACK TUBULATION ALONG CUT IN CLOSED CHAMBER SLOWLY FILL CHAMBER AND TUBE WITH GAS Fig. 3.
METHOD FOR FILLING AN EVACUATED ELECTRON TUBE WITH GAS TO ATMOSPHERIC PRESSURE BACKGROUND OF THE INVENTION In one prior method for opening an evacuated cathode-ray tube tube described in U.S. Pat. No. 3,063,777 to A. M. Trax, a portion of the neck is cracked off with a hot wire and discarded. Cracking off the neck permits entry of gas at atmospheric pressure. When this method is applied to regunning shadow-mask-type color-television-picture tubes, the gas enters so rapidly that glass particles obtained from cracking the neck may be swept into the tube and may result in blocked mask apertures.
In a second method for opening an evacuated cathode-ray tube described in U.S. Pat. No. 3,404,933 to R. J. Weideman, a portion of the tube and the tipoff tabulation are positioned in a chamber. The chamber is evacuated, after which the tabulation is broken by impact from a pointed end of a plunger. A dry inert noncontaminating gas is then admitted into the evacuated envelope. This second prior method requires evacuation equipment since a substantially large chamber must be evacuated. Only after the chamber is evacuated may the exhaust tubulation be broken in order to prevent particles from being swept into the opened tube by the inrush of gas at atmospheric pressure. In addition, when the tubulation .is broken by impact from a plunger, many small glass particles are generated, some of which may enter the tube as a result of the impact force of the plunger and be further swept into the tube during gas filling of the tube. These particles may contaminate the tube, which may result in defective performance of the tube after reevacuation.
SUMMARY OF THE INVENTION The novel method includes scribing or otherwise making a circumferential cut on the glass exhaust tubulation of an electron tube, positioning the tubulation inside a close-fitting, closed chamber, cracking the tubulation on the cut, and slowly filling the tube with gas at a low rate of inflow to atmospheric pressure.
Unlike the prior methods, the exhaust tubulation of the tube is placed in a small close-fitting, closed chamber containing a small internal gas volume. By enclosing the tubulation in a close-fitting, closed chamber having a minimum volume, no substantial inrush of gas occurs upon opening the tube in the chamber, and there is no requirement to evacuate the chamber to prevent an initial inrush ofgas.
In addition, the novel process provides for opening the tube by cracking the tubulation on a previously prepared cut. By cracking the tubulation on the cut, a minimal quantity of glass particles is formed, By cracking the tubulation inside the close-fitting chamber, particles are not swept inside the tube from the initial inrush of gas, thereby avoiding blocking of the mask apertures and particle contamination. This novel process permits cost reduction in opening of evacuated tubes for repair by obviating the need for evacuation equipment, an evacuated chamber, or a gas filled chamber, resulting in more economical rebuilding of electron tubes.
The novel apparatus includes a means for cracking the tubulation comprising a closed chamber having a flexible portion and a solid portion. The flexible portion seals over the tubulation, and the solid portion fits over the tubulation substantially conforming and closely spaced from the tubulation. The apparatus includes a means to fill the tube chamber at a substantially low rate of inflow to atmospheric air pressure. The novel apparatus is of a simple structure, which is economical to operate and maintain.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional elevational view of a scribing assembly used in practicing the novel method.
FIG. 2 is an elevational view, partially in broken sections, of a tubefilling assembly used in practicing the novel method.
FIG. 3 is a flow diagram showing the steps of the novel method.
DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 and FIG. 2 include the bottom portion of an electron tube 10 (partially shown) having a glass envelope 1] including a neck 12, stem leads 13, and glass exhaust tubulation 14 with tipoff 15 positioned in apparatus for opening the tube 10 to air at atmospheric pressure.
The apparatus shown in FIG. 1 is a tubulation-scribing assembly 16. The scribing assembly 16 includes a handle 17 having a handle hole 18 in one end slightly larger than the maximum diameter of the tubulation 14. A cutting tool 19 having a cutting point 20 extends through the handle 17 in a radial hole 21. The scribing assembly 16 includes a means for radially moving the cutting tool 19 in the radial hole 21 comprising a spring 22 attached between the cutting tool 19 and the handle 17 and a collar 23 mounted over the handle 17 having a spring adjustment 24 in contact with the spring 22. The col lar 23 also slides axially on the handle 17 to act as an adjustable stop when against the stem leads 13.
Referring to FIG. 2, a tube-filling assembly 25 includes a small, close-fitting hermetic chamber 26 formed by a flexible tubular portion 27 and a cylindrical rigid portion 28. The flexible portion 27 has a slightly smaller inner diameter than the outer diameter of the tubulation 14. One end of the flexible portion 27 is stretched to fit over the tubulation 27, and the other end is stretched to fit over the rigid portion 28. The rigid portion 28 has an axial hole 29 in one end of slightly larger diameter than the maximum diameter of the tubulation 14.
In the preferred embodiment, the diameter of the tubulation 14 is in the range of 0.349 0.365 inch, the inner diameter of the flexible portion 27 is approximately one-fourth inch, the wall thickness of the flexible portion 27 is approximately onesixteenth inch, and the diameter of the axial hole 29 is approximately three-eighths inch. The flexible portion 27 may be a rubber or plastic tubing. The preferred tubing is marketed by U.S. Stoneware Inc., Akron, Ohion, under the trade name tygon" flexible plastic tubing. A needle valve 30 having a flowcontrol knob 31 is attached to the other end of the rigid portion 28. An axial passage 32 connects the axial hole 29 and the needle valve 30. An air filter 33 is connected onthe other end of the needle valve 30.
In the operation of the apparatus, the steps of the novel method are shown in FIG. 3. The tubulation-scribing assembly 16 shown in FIG. 1 is positioned with the handle hole 18 over the tubulation 14, the collar 23 in contact with the end of the stem leads l3, and the cutting point against the side of the tubulation 14. The spring adjustment 24 is then rotated to apply pressure on the spring 22 to maintain the cutting point 20 in contact with the side of the tubulation 14. The scribing assembly I6 is then rotated, making a circumferential cut 34 on the outer surface of the tubulation 14. It is preferred that the circumferential cut 34 be about half way the length of the tubulation 14.
After the circumferential cut 34 is made, the scribing assembly 16 is removed from the tubulation l4, and the filling assembly 25 is placed over the tubulation 14, as shown in FIG. 2, with the tubulation 14 positioned in the chamber 26. In this position, the axial hole 29 in the rigid portion 28 fits over the tubulation l4 enclosing the tubulation 14 between the cut 34 and the tipoff 15. The flexible portion 27 fits over the tubulation 14, between the cut 34 and the neck 12, sealing against the tubulation 14, making the chamber 26 airtight. The open end of the flexible portion 27 also contacts the end of the neck 12 to position the end of the rigid portion 28 approximately aligned with or slightly below the cut 34.
With the tubulation 14 in the chamber 26 and the needle valve 30 closed, the tubulation 14 is cracked at the cut 34 by supporting the tube and applying a traverse pressure on the tube-filling assembly as shown by the direction arrow 35. This traverse pressure moves the filling assembly 25 to the position 36 (shown in phantom), which cracks the tubulation l4 completely through at the cut 34.
Since the tube is opened only to a small, close-fitting her metic chamber, substantially no inrush of air occurs. In addition, by cracking on the previously prepared cut 34, a minimum number of particles are created. The needle valve is then opened by rotating the knob 31 to slowly admit air into the chamber 26 and tube, subsequently filling the tube 10 with air to atmospheric pressure. The needle valve 30 is adjusted to slowly bleed air into the tube 10 and chamber 26 at a low inflow rate to atmospheric pressure. It is preferred that the inflow for a 25-inch color-picture tube fill the tube with air in 30 minutes minimum, and preferably longer to prevent particles from being swept inside the tube 10.
I claim:
1. A method for opening to a gas at atmospheric pressure an evacuated electron tube including an envelope having a glass exhaust tubulation with tipoff projecting therefrom comprising the steps of:
it making a circumferential cut on said tubulation, said cut about midway the length of said tubulation,
2. positioning said tubulation with said cut portion contained within a close-fitting, closed hermetic chamber,
3. cracking said tubulation along said out in said closed chamber,
4. and slowly filling said chamber and tube with said gas at a low inflow rate.
2. The method defined in claim 1 wherein said chamber includes a flexible portion and a rigid portion, said flexible portion sealing with said tubulation between said cut and said glass envelope, and said rigid portion enclosing and substantially conforming to and spaced from said tabulation between said out and said tipofi", and said cracking step comprises applying a traverse pressure on said rigid portion, said flexible portion distorting to remain sealed with said tubulation.
3. The method of claim 1 wherein said inflow rate fills said tube to atmospheric pressure in 30 minutes minimum time.

Claims (6)

1. A method for opening to a gas at atmospheric pressure an evacuated electron tube including an envelope having a glass exhaust tubulation with tipoff projecting therefrom comprising the steps of: 1. making a circumferential cut on said tubulation, said cut about midway the length of said tubulation, 2. positioning said tubulation with said cut portion contained within a close-fitting, closed hermetic chamber, 3. cracking said tubulation along said cut in said closed chamber, 4. and slowly filling said chamber and tube with said gas at a low inflow rate.
2. positioning said tubulation with said cut portion contained within a close-fitting, closed hermetic chamber,
2. The method defined in claim 1 wherein said chamber includes a flexible portion and a rigid portion, said flexible portion sealing with said tubulation between said cut and said glass envelope, and said rigid portion enclosing and substantially conforming to and spaced from said tabulation between said cut and said tipoff, and said cracking step comprises applying a traverse pressure on said rigid portion, said flexible portion distorting to remain sealed with said tubulation.
3. The method of claim 1 wherein said inflow rate fills said tube to atmospheric pressure in 30 minutes minimum time.
3. cracking said tubulation along said cut in said closed chamber,
4. and slowly filling said chamber and tube with said gas at a low inflow rate.
US3679284D 1970-08-21 1970-08-21 Method for filling an evacuated electron tube with gas to atmospheric pressure Expired - Lifetime US3679284A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US6578770A 1970-08-21 1970-08-21

Publications (1)

Publication Number Publication Date
US3679284A true US3679284A (en) 1972-07-25

Family

ID=22065105

Family Applications (1)

Application Number Title Priority Date Filing Date
US3679284D Expired - Lifetime US3679284A (en) 1970-08-21 1970-08-21 Method for filling an evacuated electron tube with gas to atmospheric pressure

Country Status (2)

Country Link
US (1) US3679284A (en)
JP (1) JPS5318144B1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4269616A (en) * 1980-08-13 1981-05-26 Rca Corporation Temperature insensitive filter for kinescope envelopes
US4715838A (en) * 1985-04-30 1987-12-29 Mrt System Aktiebolag Apparatus for recovering fluorescent material from mercury vapor discharge lamps

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2730472A (en) * 1952-05-07 1956-01-10 Ohio Crankshaft Co Method of manufacturing hollow tubular articles
US3124872A (en) * 1964-03-17 Method and apparatus for severing a continuous
US3316685A (en) * 1962-07-25 1967-05-02 Universal Oil Prod Co Method for anchoring a concrete type of covering to a metal wall section with multiple anchor strip means
US3390033A (en) * 1964-08-13 1968-06-25 Rca Corp Method of separating frit sealed parts of an electron tube
US3404933A (en) * 1966-12-19 1968-10-08 Sylvania Electric Prod Method and apparatus utilized in repairing electron tubes

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3124872A (en) * 1964-03-17 Method and apparatus for severing a continuous
US2730472A (en) * 1952-05-07 1956-01-10 Ohio Crankshaft Co Method of manufacturing hollow tubular articles
US3316685A (en) * 1962-07-25 1967-05-02 Universal Oil Prod Co Method for anchoring a concrete type of covering to a metal wall section with multiple anchor strip means
US3390033A (en) * 1964-08-13 1968-06-25 Rca Corp Method of separating frit sealed parts of an electron tube
US3404933A (en) * 1966-12-19 1968-10-08 Sylvania Electric Prod Method and apparatus utilized in repairing electron tubes

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4269616A (en) * 1980-08-13 1981-05-26 Rca Corporation Temperature insensitive filter for kinescope envelopes
US4715838A (en) * 1985-04-30 1987-12-29 Mrt System Aktiebolag Apparatus for recovering fluorescent material from mercury vapor discharge lamps

Also Published As

Publication number Publication date
JPS5318144B1 (en) 1978-06-13

Similar Documents

Publication Publication Date Title
US3679284A (en) Method for filling an evacuated electron tube with gas to atmospheric pressure
US2893182A (en) Method of sealing resistors
US2010934A (en) Cementing process and apparatus
US2716584A (en) Double hermetic seal for gaseous discharge lamps
US3981554A (en) Method of air letting an evacuated cathode ray tube
US3404933A (en) Method and apparatus utilized in repairing electron tubes
US2935825A (en) Manufacture of electric incandescent lamps and similar devices
US2561838A (en) Tipping-off method
US2569723A (en) Envelope for electric devices
US2032862A (en) Device for sealing-off metal tanks
US2794699A (en) Manufacture of small lamps
US2428059A (en) Sealing of wires into glass
US2494915A (en) Method of gas-filling and sealing vessels
US4061943A (en) Cathode ray tube with supported conductor extending through exhaust tubulation
US1398033A (en) Method of making incandescent lamps
US2671291A (en) Glassworking apparatus and method
US4371224A (en) Single turret machine for fabricating high-intensity discharge arc tubes
GB533106A (en) Improvements in and relating to methods of exhausting and sealing envelopes having a metal portion to which the seal is applied
ES342745A1 (en) Cylindrical miniature incandescent lamps and methods of making the same
US3248118A (en) Discharge devices fabricating apparatus and method
US3746419A (en) Method and apparatus for rebuilding television picture tubes
US2607901A (en) Electronic discharge device
JPH0592136A (en) Adsorbent packing bag and production thereof
US1547752A (en) Valve for exhausting machines
US3767283A (en) Improvements in or relating to electron discharge devices

Legal Events

Date Code Title Description
AS Assignment

Owner name: RCA LICENSING CORPORATION, TWO INDEPENDENCE WAY, P

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:RCA CORPORATION, A CORP. OF DE;REEL/FRAME:004993/0131

Effective date: 19871208