US4268712A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron display tubes
Assignee: US Philips Corp
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Filing: 1979-05-25
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Granted: 1981-05-19
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Expires: 1999-05-25
Abstract
Abstract An electron display tube has its flat glass plate sealed to the flange of its metal cone, or funnel, by the use of a pressure deformable metal strip between the flange and the plate and several U-shaped clamps at the edge of the flange and plate urging the plate and flange towards each other and a metal rimband around the edges of the plate and flange and embracing the clamps so as to maintain them in compression.
Inventors
- 👤 Colin D. Overall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:59
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/86; H01J29/87; H01J29/92
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
143 words
An electron display tube comprising a flat, glass face-plate, a metal cone provided with a flange, a metallic pressure-deformable material bonding said flange to said face-plate, the pressure-deformable material having a melting-point of more than 300° C., at least two lengths in combination of a substantially U-shaped metal channel member having asymmetrically disposed limbs extending around substantially the whole periphery of the face-plate and clamping said face-plate and flange, a first limb of said channel member extending along the outside main surface of the face-plate, the second limb of said channel member diverging from the edge of the face-plate with respect to the first limb and urging the flange of the cone portion by means of a wedging action towards the face-plate, and a metal rimband tightly embracing the lengths of the channel member so as to maintain the pressure-deformable material in compression.
Claim 2
Dependent Claim
143 words
An electron display tube comprising a flat, glass face-plate, a metal cone provided with a flange, a metallic pressure-deformable material bonding said flange to said face-plate, the pressure-deformable material having a melting-point of more than 300° C., at least two lengths in combination of a substantially U-shaped metal channel member having asymmetrically disposed limbs extending around substantially the whole periphery of the face-plate and clamping said face-plate and flange, a first limb of said channel member extending along the outside main surface of the face-plate, the second limb of said channel member diverging from the edge of the face-plate with respect to the first limb and urging the flange of the cone portion by means of a wedging action towards the face-plate, and a metal rimband tightly embracing the lengths of the channel member so as to maintain the pressure-deformable material in compression.
Claim 3
Dependent Claim
15 words
An electron display tube as claimed in claim 1, wherein the rimband comprises stainless steel.
Claim 4
Dependent Claim
17 words
An electron display tube as claimed in claim 1 or claim 2, wherein the rimband is endless.
Claim 5
Dependent Claim
18 words
An electron display tube as claimed in claim 1 or 2, wherein the face-plate consists of toughened glass.
Claim 6
Dependent Claim
18 words
An electron display tube as claimed in claim 1 or 2, wherein the channel member comprises mild steel.
Claim 7
Dependent Claim
19 words
An electron display tube as claimed in claim 1 or 2, wherein the metal cone portion comprises mild steel.
Claim 8
Dependent Claim
30 words
An electron display tube as claimed in claim 1 or 2, wherein the pressure-deformable material is a malleable metal having a melting-point in the range from 300° to 700° C.
Claim 9
Dependent Claim
15 words
An electron display tube as claimed in claim 7, wherein the malleable metal is lead.
Claim 10
Dependent Claim
16 words
An electron display tube as claimed in claim 1 or 2, wherein the face-plate is circular.
Claim 11
Dependent Claim
26 words
An electron display tube as claimed in claim 1 or 2, wherein the face-plate is substantially rectangular and there are for lengths of the channel member.
Claim 12
Dependent Claim
32 words
An electron display tube as claimed in claim 1 or 2, wherein the cone portion includes inwardly extending integrally formed sleeve portions carrying lead-throughs sealed into the sleeves in a vacuum-tight manner.
Claim 13
Independent Claim
200 words
A method of sealing a flat glass face-plate in a vacuum-tight manner to the flange of a metal cone, the method comprising the steps of locating a loop of a metallic pressure-deformable material between substantially flat opposed surfaces of the face-plate and of the flange, pressing the face-plate and the flange towards each other in a press at a temperature within the range of 200° to 450° C. so as to produce a mechanical bond via the pressure-deformable member which has been deformed by the applied pressure, which temperature is below the melting-point of the pressure-deformable material and below the lowest temperature at which a liquid phase would form during application of the pressure by interaction between the pressure-deformable material and the flange, removing the assembly from the press, fitting at least two lengths of a substantially U-shaped channel member around the periphery of the face-plate and the opposed flange so as to extend around substantially the whole of the said periphery, positioning a metal rimband so as to surround the lengths of the substantially U-shaped channel member, and tightening the rimband so as to tightly embrace the lengths of the channel member and maintain the pressure-deformable material in compression.
Claim 14
Independent Claim
200 words
A method of sealing a flat glass face-plate in a vacuum-tight manner to the flange of a metal cone, the method comprising the steps of locating a loop of a metallic pressure-deformable material between substantially flat opposed surfaces of the face-plate and of the flange, pressing the face-plate and the flange towards each other in a press at a temperature within the range of 200° to 450° C. so as to produce a mechanical bond via the pressure-deformable member which has been deformed by the applied pressure, which temperature is below the melting-point of the pressure-deformable material and below the lowest temperature at which a liquid phase would form during application of the pressure by interaction between the pressure-deformable material and the flange, removing the assembly from the press, fitting at least two lengths of a substantially U-shaped channel member around the periphery of the face-plate and the opposed flange so as to extend around substantially the whole of the said periphery, positioning a metal rimband so as to surround the lengths of the substantially U-shaped channel member, and tightening the rimband so as to tightly embrace the lengths of the channel member and maintain the pressure-deformable material in compression.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-05-18 | 1984-11-17 | 1985-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-18 | 1988-11-17 | 1989-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-18 | 1992-11-17 | 1993-05-19 | $7700.00 | Window Closed / Lapsed |